x＝(2t－1)／(t－1) Express T with the expression of X Express t in terms of X,

x＝(2t－1)／(t－1) Express T with the expression of X Express t in terms of X,

x=(2t-1)/(t-1) xt-x=2t-1 (x-2)t=x-1 t=(x-1)/(x-2)
A very, very simple formula (Mathematics)
Which is right?
I am very vague
.
(a+b/a-b)^2=a^2+b^2/a^2-b^2
(a+b/a-b)^2=(a+b)^2/(a-b)^2
Which one is right?
2 pairs
Seventh grade mathematics formula method (only one problem, to integral)
Square of (a-b) - C square
(a-b+c)(a-b-c)
According to the square difference formula
All the formulas from grade one to grade six, and examples
1. Circumference of rectangle = (length + width) × 2 C = (a + b) × 2
2. Perimeter of square = side length × 4 C = 4A
3. Area of rectangle = length × width s = ab
4. Area of square = side length × side length s = A.A = a
5. Area of triangle = bottom × height △ 2 s = ah △ 2
6. Area of parallelogram = base × height s = ah
7. Area of trapezoid = (upper bottom + lower bottom) × height △ 2 s = (a + b) H △ 2
8. Diameter = radius × 2 D = 2R radius = diameter △ 2 r = D △ 2
9. Circumference of circle = circumference × diameter = circumference × radius × 2 C = π d = 2 π R
10. Area of circle = circumference × radius × radius = π R
11. The surface area of cuboid = (length × width + length × height + width × height) × 2
12. Volume of cuboid = length × width × height v = ABH
13. The surface area of cube is edge length × edge length × 6 s = 6A
14. The volume of cube = edge length × edge length × edge length v = a.a.a = a
15. Side area of cylinder = perimeter of bottom circle × height s = Ch
16. Surface area of cylinder = area of upper and lower bottom surface + side area
S=2πr +2πrh=2π(d÷2) +2π(d÷2)h=2π(C÷2÷π) +Ch
17. Volume of cylinder = bottom area × height v = sh
V=πr h=π(d÷2) h=π(C÷2÷π) h
18. The volume of the cone = the area of the bottom × the height △ 3
V=Sh÷3=πr h÷3=π(d÷2) h÷3=π(C÷2÷π) h÷3
1. Number of copies × number of copies = total number of copies / number of copies = total number of copies / number of copies = number of copies
2. 1 times × times = several times △ 1 times = several times △ 1 times
3. Speed × time = distance △ speed = time distance △ time = speed
4. Unit price × quantity = total price / unit price = total quantity / quantity = unit price
5. Work efficiency × work time = total amount of work △ work efficiency = total amount of work time △ work time = work efficiency
6. Addend + addend = sum - one addend = another addend
7. Subtracted - subtracted = difference subtracted - difference = subtracted difference + subtracted = subtracted
8. Factor × factor = product △ one factor = another factor
9. Divisor / divisor = quotient divisor / quotient = divisor quotient × divisor = divisor
Primary school mathematics figure calculation formula
1. Square C perimeter s area a side perimeter perimeter = side length × 4 C = 4A area = side length × side length s = a × a
2. Cube V: Volume A: edge length surface area = edge length × edge length × 6 s surface = a × a × 6 volume = edge length × edge length × edge length v = a × a × a
3. Rectangle
C perimeter s area a side length
Perimeter = (length + width) × 2
C=2(a+b)
Area = length × width
S=ab
4. Cuboid
5: Volume s: Area A: length B: width H: height
(1) Surface area (L × W + L × H + W × h) × 2
S=2(ab+ah+bh)
(2) Volume = length × width × height
V=abh
5 triangles
S area a bottom h height
Area = bottom × height △ 2
s=ah÷2
Triangle height = area × 2 △ bottom
Triangle bottom = area × 2 △ height
6 parallelogram
S area a bottom h height
Area = bottom × height
s=ah
7 trapezoid
S area a upper bottom B lower bottom h height
Area = (upper bottom + lower bottom) × height △ 2
s=(a+b)× h÷2
8 round
S area C perimeter Π d = diameter r = radius
(1) Perimeter = diameter ×Π = 2 ×Π× radius
C=∏d=2∏r
(2) Area = radius × radius ×Π
9 cylinder
v: Volume H: height s; bottom area R: bottom radius C: bottom perimeter
(1) Side area = perimeter of bottom surface × height
(2) Surface area = side area + bottom area × 2
(3) Volume = bottom area × height
(4) Volume = side area △ 2 × radius
10 cone
v: Volume H: height s; bottom area R: bottom radius
Volume = bottom area × height △ 3
Total number △ total number of copies = average number
Sum difference problem
(sum + difference) △ 2 = large number
(sum difference) △ 2 = decimal
The problem of sum times
Sum (multiple-1) = decimal
Decimals × multiples = large numbers
(or sum - decimal = large)
Differential multiple problem
Difference (multiple-1) = decimal
Decimals × multiples = large numbers
(or decimal + difference = large)
The problem of tree planting
1. The tree planting problem on non closed lines can be divided into the following three cases
(1) if trees are to be planted at both ends of the non closed line, then:
Number of plants = number of segments + 1 = total length △ plant spacing-1
Total length = plant spacing × (number of plants - 1)
Plant spacing = total length (number of plants - 1)
(2) if trees are to be planted at one end of the non closed line and not at the other end, then:
Number of plants = number of segments = total length △ plant spacing
Total length = plant spacing × number of plants
Plant spacing = total length △ number of plants
(3) if trees are not planted at both ends of the non closed line, then:
Number of plants = number of segments-1 = total length △ spacing-1
Total length = plant spacing × (number of plants + 1)
Plant spacing = total length (number of plants + 1)
2. The quantitative relationship of tree planting on closed lines is as follows
Number of plants = number of segments = total length △ plant spacing
Total length = plant spacing × number of plants
Plant spacing = total length △ number of plants
Profit and loss
(profit + loss) △ the difference between the two distributions = the number of shares participating in the distribution
(big profit - small profit) △ the difference between the two distributions = the number of shares participating in the distribution
(big loss - small loss) △ the difference between the two distributions = the number of shares participating in the distribution
Encounter problem
Encounter distance = speed and X encounter time
Encounter time = encounter distance △ speed and
Speed sum = encounter distance △ encounter time
Follow up questions
Pursuit distance = speed difference × pursuit time
Pursuit time = pursuit distance △ speed difference
Speed difference = pursuit distance △ pursuit time
Flow problem
Downstream velocity = hydrostatic velocity + water velocity
Countercurrent velocity = still water velocity - water velocity
Hydrostatic velocity = (downstream velocity + countercurrent velocity) △ 2
Water flow velocity = (downstream velocity countercurrent velocity) △ 2
Concentration problem
Weight of solute + weight of solvent = weight of solution
Weight of solute / weight of solution × 100% = concentration
Weight of solution × concentration = weight of solute
Weight of solute △ concentration = weight of solution
Profit and discount
Profit = selling price cost
Profit margin = profit / cost × 100% = (selling price / cost-1) × 100%
Up and down amount = principal × up and down percentage
Discount = actual selling price △ original selling price × 100% (discount < 1)
Interest = principal × interest rate × time
After tax interest = principal × interest rate × time × (1-20%)
What's the area formula of a circle? I want it with characters, not English letters, 2
The area of a circle is equal to the circumference times the square of its radius
All the literal formulas or alphabetic formulas about mathematics~
A large collection of mathematical formulas and theorems in junior and senior high schools (for reference only)
There is only one straight line through two points
2 the shortest line segment between two points
3. The complementary angles of the same angle or equal angle are equal
The remainder of the same or equal angle is equal
There is and only one line perpendicular to a known line passing through a point
Among all the line segments connected by a point outside the line and each point on the line, the vertical line segment is the shortest
The axiom of parallelism passes through a point outside the line, and there is only one line parallel to it
If both lines are parallel to the third line, the two lines are parallel to each other
The two lines are parallel
The internal stagger angles are equal and the two lines are parallel
The inner angles of the same side are complementary, and the two lines are parallel
The two straight lines are parallel and have the same angle
The two straight lines are parallel and the internal stagger angles are equal
The two lines are parallel, and the internal angles of the same side complement each other
Theorem 15 the sum of two sides of a triangle is greater than the third side
16 infer that the difference between the two sides of a triangle is less than the third side
The sum of the three internal angles of a triangle is 180 degrees
18 corollary 1 two acute angles of right triangle complement each other
Corollary 2 one exterior angle of a triangle is equal to the sum of two interior angles not adjacent to it
The outer angle of a triangle is greater than any inner angle not adjacent to it
The corresponding sides and angles of congruent triangles are equal
SAS has two congruent triangles whose two sides and their angles are equal
The 23 angle and side angle axiom (ASA) has two congruent triangles with two equal angles and their pinch sides
Inference (AAS) has two angles and the opposite sides of one of them corresponding to two equal triangles congruent
The 25 edge axiom (SSS) has two congruent triangles with three equal sides
The axiom of hypotenuse and right edge (HL) has hypotenuse and a right edge corresponding to two equal right triangles
Theorem 1 the distance from a point on the bisector of an angle to both sides of the angle is equal
Theorem 2 a point at the same distance from both sides of an angle is on the bisector of the angle
The bisector of angle 29 is the set of all points with equal distance to both sides of the angle
The property theorem of isosceles triangle
The bisector of the vertex of an isosceles triangle bisects the base and is perpendicular to it
The bisector of the vertex, the middle line on the bottom and the height on the bottom of an isosceles triangle coincide with each other
33 corollary 3 the angles of an equilateral triangle are equal, and each angle is equal to 60 degrees
If two angles of a triangle are equal, then the opposite sides of the two angles are also equal
Corollary 1 a triangle whose three angles are equal is an equilateral triangle
36 corollary 2 an isosceles triangle with an angle equal to 60 ° is an equilateral triangle
In a right triangle, if an acute angle is equal to 30 degrees, the right side it faces is half of the hypotenuse
The center line on the hypotenuse of a right triangle is equal to half of the hypotenuse
Theorem 39 is the distance between the point on the vertical bisector of a line segment and the two ends of the line segment equal?
The inverse theorem and the point of a line segment with equal distance between two ends are on the vertical bisector of the line segment
The vertical bisector of line segment 41 can be regarded as a set of all points with equal distance from the two ends of the line segment
Theorem 42 theorem 1 two figures symmetrical about a line are congruent
Theorem 2 if two figures are symmetrical with respect to a line, then the axis of symmetry is the vertical bisector of the line connecting the corresponding points
Theorem 3 two figures are symmetrical with respect to a line. If their corresponding line segments or extension lines intersect, then the intersection point is on the axis of symmetry
45 inverse theorem if the line connecting the corresponding points of two figures is vertically bisected by the same line, then the two figures are symmetrical about the line
46 Pythagorean theorem the sum of squares of two right sides a and B of a right triangle is equal to the square of hypotenuse C, that is, a ^ 2 + B ^ 2 = C ^ 2
The inverse theorem of Pythagorean theorem if the lengths of three sides a, B and C of a triangle are related to a ^ 2 + B ^ 2 = C ^ 2, then the triangle is a right triangle
Theorem 48 the sum of internal angles of a quadrilateral is equal to 360 degrees
The sum of the external angles of a quadrilateral is equal to 360 degrees
The sum of inner angles of n-polygon is equal to (n-2) × 180 degree
51 infer that the sum of external angles of any polygon is equal to 360 degrees
Property theorem of parallelogram 1 diagonal equality of parallelogram
Property theorem of parallelogram 2. The opposite sides of parallelogram are equal
54 infer that the parallel line segments sandwiched between two parallel lines are equal
Property theorem of parallelogram 3 the diagonals of parallelogram are equally divided
Two groups of diagonally equal quadrilaterals are parallelograms
Two groups of parallelograms whose opposite sides are equal are parallelograms
58 parallelogram determination Theorem 3 a quadrilateral whose diagonals are equally divided is a parallelogram
A group of parallelograms whose opposite sides are parallel and equal are parallelograms
The four corners of a rectangle are right angles
Theorem 2 the diagonals of rectangles are equal
Rectangle theorem 1 a quadrilateral with three right angles is a rectangle
63 rectangle judgment theorem 2