The first question: the answer is x- 1, because the square of (1-x) = the square of (x-1), both sides can cancel (1-x) at the same time.

The second question: (1) The answer is: the square of 9a-the square of ——4b; Formula (square difference formula), there is no special method.

(2) The answer is: the square of b-65438+the square of 0/4a; Process: (-1/2a-b) (1/2a-b) =-(1/2a+b) (1/2a-b), and then apply the square difference formula.

(3) The answer is: the square surrounded by ab-1. Application of variance formula.

(4) The answer is: A to the 4th power-1 process: (a+ 1)*(a to the 2nd power+1) * (A-1) = [(A+1) * (A

The answer to the third question is: m=-20. Process: first expand the right side of the equation =4x square +20xy+25y square, and the natural m=-20.

Question 4: (1) answer: the square complete square formula of (a-8)

(2) Answer: the square of (x-2y); Process: Equation =-(square of x-square of 4xy+y) = square of =-(x-2y.

(3) Answer: the squaring process of x(x+ 1): Equation =x(4x squared +4x+ 1)= x(x+ 1) squared.

(4) Answer: 88209 Process: the square of the equation = (300-3) = the square of 300-2 * 300 * 3+3 =90000- 1800+9=88209.

(5) Answer: 106.09 Process: the square of the equation = (10+0.3) =10+2 *10 * 0.3+0.09 square.

I hope I can understand.

(5) the answer