Question

Chung minh bieu thuc sau khong phu thuoc vao bien:

A=3x²(x-1)-x²(3x+2)+x(5x-4)+4(x-6)

B=(3x-6y).(x²⁺2xy+4y²)-3(x³-8y³+10)

C=(2x-1)(x²+x-1)-(x²-5)-2(x+1)(x²-x+1)+3(x-2)

D=(x²-3x+5)²+2(x²-3x+5)(1+3x-x²)+(1-x²+3x)²

E=(3x-2)(9x²+6x+4)-27(x+60)(x²-6x+36)

Answer 1

OIMEOI

Answer 2

may lam dai the thi cho no giai ho a