Different denominator fraction addition and subtraction 1200 oral problems!

Different denominator fraction addition and subtraction 1200 oral problems!

3/4+1/5=4/5 3/4-1/5=11/20 5/6+2/9=19/18 5/6-2/9=11/18 2/3+3/5=19/15
2/3-3/5=1/15 6/7+1/2=19/14 6/7-1/2=5/14 2/3+1/6=5/6 1/3+1/4=7/12
1/3-1/4=1/12 1/5+1/7=12/35 1/5-1/7=2/35 1/4+1/9=13/36 1/4-1/9=5/36
1/8+1/9=17/72 1/8-1/9=1/72 1/10+7/9=79/90 5/7-1/6=23/42 1-5/9=4/9
1/5+3/8=23/40 3/4+1/5=19/20 2/3-3/5=1/5 1-2/5=3/5 5/8-1/9=37/72
1/10-1/20=1/20 1/6+3/8=13/24 5/9-1/2=1/18 2/3+1/4=11/12 1/2+1/3=5/6
5/6+1/18=8/9 3/5-1/3=4/15 17/15-1/3=4/5 11/12-2/3=1/4 1/2-1/4=1/4
1/7-1/8=1/56 1/3-1/9=2/9 5/6-1/2=1/3 1-2/3=1/3 5/8-1/6=11/24
1/3+1/6=1/2 3/4-1/2=1/4 1/5+1/8=13/40 5/6+4/9=23/18 5/9-2/5=7/45
3/7+5/2=41/14 5/8+9/10=61/40 11/12-8/15=23/60 1/4+1/6=5/12 1/4-1/6=1/12
1-6/7=1/7 11/12-2/3=1/4 3/10+2/5=7/10 7/8-1/4=5/8 3/4+5/12=7/6
3/5-3/7=6/35 5/4-5/12=5/6 1/5-1/9=4/45 1/3-1/8=5/24 11/6-2/9=29/18
1/5+1/9=14/45 1-2/5=3/5 7/4+1/7=53/28 1-1/9=8/9 2/3-2/7=8/21
5/6+1/2=4/3 4/3-3/4=7/12 1-4/7=3/7 4/3+3/2=17/6 5/9+18/5=5/6
3/8+7/10+5/8=17/10 7/8-(1/8+3/4)=0 4/7+1/6-4/7=1/6
2-7/9-2/9=1 3/5+7/8+2/5=15/8 7/9-(1/9+1/3)=1/3
1/4+(2/5+3/4)=7/5 5/6-3/10+1/6-7/10=0 3/4+1/6-2/3=1/4
7/8-1/4+4/9=77/72 1-1/3+2/7=20/21 1/2+4/5-3/10=1
5/6-(2/3-1/9)=5/18 9/10-(3/4+1/8)=1/40 1/2+2/3-3/4=5/12
7/8-1/6+1/4=23/24 1-(3/4-2/9)=17/36 9/10-1/5-1/2=1/5
1/4+3/7+1/2=33/28 7/8-(2/3+1/6)=1/24 1-(1/3+3/5)=1/15
1/2+1/4+1/3=13/12 7/8+1/4+1/2=5/8 5/7-(4/7+1/9)=2/63
1-1/4-1/2=1/4 3/4-1/6-1/3=1/4 3/10+1/4+2/5=19/20
2/3+1/6+1/12=11/12 1-1/4-2/5=7/20 1/2+1/9+1/12=25/36
(Note: the front one is molecule, the back one is molecule, for example, 2 / 3 is two thirds)
On the reciprocal method of rational division
How to use the reciprocal method, and then reverse it at the end? Why
Because dividing by a number is equal to multiplying by the reciprocal of that number
The reciprocal is to reverse the numerator and denominator
as
2÷2/3
=2×3/2
=3
Find the area of the triangle which is parallel to the line 3x + 4Y + 9 = 0 and enclosed by the two coordinate axes in the first quadrant is 24
The linear equation of
Suppose that the line is 3x + 4Y + a = 0
When x = 0, y = - A / 4
When y = 0, x = - A / 3
The area enclosed in the first quadrant is s = 0.5 * x * y = 24
The solution is a = - 24
So the straight line is 3x + 4y-24 = 0
100 questions on the addition and subtraction of fractions with different denominators or the same denominator
Multiplication of mathematical rational numbers,
The multiplication of rational numbers and division of rational numbers in mathematics. Please give me a detailed explanation
Some examples are given, especially the mixed operation of rational numbers
How to calculate the speed
Rational number: the number of infinite acyclic decimals and open roots is called irrational number, such as π, 3.141592653... And rational number is just the opposite. Integers and fractions are collectively referred to as rational numbers, including integers and commonly known fractions, which can also be expressed as finite decimals or infinite cyclic decimals
Given that the line L is perpendicular to the line 3x-4y-7 = 0, the circumference of the triangle formed by the line L and the two coordinate axes is 10, the equation of the line L is obtained
∵ the line L is perpendicular to the line 3x-4y-7 = 0, let the equation of the line l be 4x + 3Y + B = 0, then the intersection points of the line L with the X axis and Y axis are a (− B4, 0), B (0, − B3).. | ab | = 512b. From | OA | + | ob | + | ab | = 10, we get | B | 4 + | B | 3 + 5 | B | 12 = 10. | B = ± 10. | the equation of the line L is 4x + 3Y + 10 = 0, or 4x + 3y-10 = 0
Urgently ask the oral arithmetic exercises of addition and subtraction within 200-300
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300-200 298-269
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299-263 291-289: ask for 100 oral arithmetic exercises within 200-300
What is the relationship between division of rational numbers and multiplication of rational numbers?
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Dividing by a rational number is equal to multiplying by the reciprocal of the rational number; similarly, multiplying by a rational number is equal to dividing by the reciprocal of the rational number
This is the basic relationship between division of rational numbers and multiplication of rational numbers. In fact, it is applicable to the range of real numbers and complex numbers
Positive leads to positive, negative leads to negative, negative leads to positive
The relationship between division and multiplication: dividing by a rational number is equal to multiplying by the reciprocal of the rational number, so similarly, multiplying by a rational number is equal to dividing by the reciprocal of the rational number. (divisor ≠ 0)
If the line L passes through the fixed point a (- 2,3) and forms a triangle with two coordinate axes, and the area is 4, the equation of line L is obtained
Let the linear equation be XA + Yb = 1, ∵ the line L passes through the fixed point a (- 2,3), and the area of the triangle surrounding the two coordinate axes be 4, ∵ 2A + 3B = 112 | ab | = 4. The solution is a = - 43b = - 6 or a = 4B = 2, so the equation of the line L is x − 43 + y − 6 = 1 or X4 + y2 = 1, that is 9x + 2Y + 12 = 0, or x + 2y-4 = 0
One hundred questions on the addition and subtraction of fractions with the same denominator
1 / 2 + 1 / 3 = 5 / 61 / 2 + 2 / 3 = 7 / 61 / 3 + 1 / 4 = 7 / 121 / 3 + 3 / 4 = 13 / 121 / 4 + 1 / 5 = 9 / 201 / 4 + 4 / 5 = 21 / 20... 1 / n + 1 / N + 1 = n + N + 1 / N * (n + 1) 1 / n-1 + n-1 / N = n * (n-1) + 1 / N * (n-1)~