A) A = X(4-X) + ( X-2)2B) B = (X+5)2 - (X-5)2C) C = (X-2)(2X+3) - 2X(X...

Câu 1:

a) A = x(4-x) + ( x-2)

2

b) B = (x+5)

2

- (x-5)

2

c) C = (x-2)(2x+3) - 2x(x-1) -( x-10)

d) D = (x+y)

3

- 3xy(x+y) -x

3

+ y

3