Reduction: (square of x-x-2) / (square of x-5x + 6) reduction: square of 2 (X-Y) / cube of 8 (Y-X)

Reduction: (square of x-x-2) / (square of x-5x + 6) reduction: square of 2 (X-Y) / cube of 8 (Y-X)

Simplification: (x's square-x-2) / (x's square-5x + 6)
=(x-2)(x+1)/(x-2)(x-3)
=(x+1)/(x-3)
Simplification: square of 2 (X-Y) / cube of 8 (Y-X)
=-2(x-y)²/8(x-y)³
=-1/4(x-y)
=-1/(4x-4y)

Cube of x-5x square of x-6x
Factorization
（m-n)(m+n-1)+m-n

Cube of x-5x square of x-6x
=x³-5x²-6x
=x(x²-5x-6)
=x(x-6)(x+1)
Second question
（m-n)(m+n-1)+m-n
=(m-n)(m+n-1+1)
=(m-n)(m+n)
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Simplification: (- 3 cube of 5x - 2 square of x) + 2 square of 7x

(-5*x^3-x^2)+7*x^2
=-5*x^3-(x^2-7*x^2)
=-5*x^3+6*x^2

First simplify, then evaluate: (1) the cube of 5x, the square of Y - the square of X, the square of Y / 2x, the cube of Y + the square of X, the square of Y, where x = 3 / 5, y = 1 / 2

The cube of 5x, the square of Y - the square of X, the square of Y / the cube of 2x, the square of Y + the square of X, the square of Y
=x²y²(5x-1)/x²y²(2y+1)
=(5x-1)/(2y+1)
=(3-1)/(1+1)
=1

When a, B and C buy a TV set together, half of the amount paid by a is one third of the amount paid by B, and three seventh of the amount paid by C,
It is known that C pays 120 yuan more than a, how much is this TV set?

Answer with elementary school equation. A pays X Yuan
(x + 120) C's money a's money x
(X+120)*3/7=1/2X
6X+720=7X
X=720
C pay x + 120 = 840
Party B pay 1 / 2x / 1 / 3 = 1080
The price of TV set is 720 + 1080 + 840 = 2640 yuan

The decimal point of a certain number moves one place to the right, which is 27 times larger than the original number______ ．

So the answer is: 3

Number a is 4 / 5 of number C, number B is 1.2 times of number C, what is the ratio of number a, number B and number C, and why

If C is 1, then B is 1 and 1 / 5, that is 6 / 5, so a is 4 / 5 × 6 / 5, that is 24 / 25
The ratio of a to B to C is 1:5:6:25:24, that is 25:25:25:30:25:24
That's 25 to 30 to 24

Given the equation sin ^ 2x-4sinx + 1-A = 0, then the value range of a is
A[-3,6] B [-2,6] C[-3,2] D[-2,2]

When the original equation has a real solution,
a+3=(sinx-2)².
∵-1≤sinx≤1.
∴1≤(sinx-2)²≤9.
∴1≤a+3≤9.
∴-2≤a≤6.

Four fifths of a number is 120. What's 30% of the number?

120 △ 4 / 5 × 30%
=120 × 5 / 4 × 3 / 10
=150 × 3 / 10
=45
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X-Y + Z = 0,2x + y-2z = 6,3x-y-z = 3,

The solution of the original system of equations is: {x = 2.25y}