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In a right triangle ABC, the angle c = 90 ° and the side lengths a, B, C satisfy arcsin (1 / a) + arcsin (1 / b) = Pai / 2, and LGC = LGA + LGB
In RT triangle ABC, angle c = 90 degrees, side length a, B, C and arcsin1 / A + arcsin1 / b = π / 2, prove: LGC = LGA + LGB
It's easy to calculate one half plus one sixth plus one twelfth plus one twentieth plus one thirtieth
1-1/6=5/6
If the system of inequalities {1 ≤ x ≤ 3} has a solution, then the value range of a is - x > a
It's a
The relationship between density and weight?
In the international system of units, the main unit of mass is kilogram, and the main unit of volume is cubic meter
The construction site used a pile of cement. Two seventh of it was used in the first time, and three eighth of it was used in the second time. There are 38 tons left. How many tons of this ton of cement
38÷(1-2/7-3/8)=112
A: there are 112 tons of cement
The radius and height of the bottom surface of a cylindrical steel block are 6 decimeters. How many square decimeters is the bottom area of the cone when it is melted into a cone of equal height?
It's on the study plan
The radius and height of the bottom surface of a cylindrical steel block are 6 decimeters. How many square decimeters is the bottom area of the cone when it is melted into a cone of equal height?
6*6*3.14*6
=216*3.14
=678.24 cubic decimeter
678.24/1/3/6
=678.24/2
=339.12 square decimeters
A: the floor area is 339.12 square decimeters
A number is not only a multiple of 9, but also a factor of 54______ ．
The factors of 54 are: 1, 2, 3, 6, 9, 18, 27, 54; the multiples of 9 within 54 are: 9, 18, 27, 36, 45, 54; the multiples of 9 and 54 are: 9, 18, 27, 54; so the answer is: 9, 18, 27, 54
Calculate: (3xy − 2x2 + 12y2) (3xy + 2x2 − 12y2), and find the value of the algebraic formula when x = 12, y = 2
The original formula = (3xy) 2 − (2x2 − 12y2) 2 = 9x2y2-4x4 + 2x2y2-14y4 = 11x2y2-4x4-14y4, ∵ x = 12, y = 2, ∵ original formula = 11 × (12) 2 × 22 − 4 × (12) 4 − 14 × 24 = 11-14 − 4 = 634
56 is 17 less than two times of a number. Find the number
(56+17)/2=36.5
So the number is 36.5
RELATED INFORMATIONS
- 1. In the arithmetic sequence an, we know A1 = 3 / 2, d = - 1 / 2, Sn = - 15, find the sum of N and an
- 2. The square of B = AC is ()
- 3. If B ^ 2 = a C = 9, then B is equal to 3 or a 3, there is only one answer
- 4. It is known that the sum of the three positive numbers in the arithmetic sequence is equal to 15, and the three positive numbers are added with 9 in turn, then they are in the arithmetic sequence, and the three positive numbers are solved
- 5. The extremum of higher number. Y = 2x to the third power - 6x square - 18x + 7
- 6. Where is the stationary point of the cubic power of y = 2x - 6x square - 18x + 73 Where 6x square - 12x - 18 comes from? I don't know what derivative is
- 7. If XY satisfies (x-1) ^ 2 + (y + 2) ^ 2 = 4, find the maximum and minimum of S = 2x + y
- 8. If the quadratic function f (x) has f (2 + x) = f (- x) for any real number x, then the equation of symmetry axis of F (x) is?
- 9. F (x) = ax & sup2; + BX (a ≠ 0), if the axis of symmetry of the function is x = 1 and the equation f (x) = x has equal real roots (1) Finding the analytic expression of F (x) (2) If f (x) domain [M, n] and range [2m, 2n], find the value of real number m, n
- 10. For X ∈ R, the values of quadratic function f (x) = x ^ 2-4ax + 2A + 30 (a ∈ R) are all nonnegative numbers, and the range of roots of X / (a + 3) = | A-1 | + 1 is obtained
- 11. In ABC triangle, a = 2bcosc, judge what triangle is
- 12. It is known that four real numbers - 9, A1, A2 and - 1 are equal difference sequences, and five real numbers - 9, B1, B2, B3 and - 1 are equal proportion sequences, then B2 (a2-a1) = () A. 8B. -8C. ±8D. 98
- 13. If A1, A2, A3 are known to be an arithmetic sequence, B1, B2, B3 are known to be an arithmetic sequence, and these six numbers are all real numbers, then the correct conclusion in the following four conclusions is () ① A1a3 may be established at the same time; ② B1 < B2 and B2 > B3 may hold simultaneously ③ If a1 + A2
- 14. a. The sum of the three numbers is 12, and A-1, B, C + 10 are equal ratio series Big brother, I can guess the numbers
- 15. It is known that a and B are two unequal positive numbers, and a, x, y and B are in equal difference sequence in turn, and a, m, N and B are in equal proportion sequence in turn. Try to compare the size of X + y and M + n
- 16. Isochromatic In the known equal ratio sequence {an}, A3 = 16, common ratio q = 1 / 2 Q: if the sum of the first n terms of the sequence {an} is Sn = 124, find the value of n The first n terms of {an} and Sn = - 2n ^ - n are known Ask: seek a1 + a3 + A5 + +The value of a25
- 17. It is known that a, B and C are equal ratio sequence, B, m, a and B, N and C are two equal difference sequence, then am + CN = () A. 4B. 3C. 2D. 1
- 18. X-8 / 5x = 48 solution equation
- 19. Detailed process of solving equation: 0 = - 1 / 16 (x-4) ^ 2 + 3
- 20. The tangent equation of curve y = 2x + 1 / X at point (1,3) is? Finally, there are steps, The tangent equation of y = 2x + (1 / x) at point (1,3) is