Question

Bài 1 : Rút gọn

A= 3(x-1)²-(x+1)²+2(x-3)(x+3)-(2x+3)²-(5-20x)

B= 5x(x-7)(x+7)-x(2x-1)²-(x³+4x²-246x)-175

C= -2x(3x+2)²+(4x+1)²+2(x³+8x+3x-2)-(5-x)

D= (5x-2)²-(6x+1)²+11(x-2)(x+2)-16(3-2x)

E= 4x(x+3)-(x-5)²-3(x+1)²+(2x+2)²-(4x+5)

F= (2x-3)(x+2)(x-2)-2(x+3)-(x+4)³+(x-3)(x²+3x+9)+9x²+110x

Answer 1

Bài 1:

a: \(A=3\left(x^2-2x+1\right)-\left(x^2+2x+1\right)+2\left(x^2-9\right)-\left(4x^2+12x+9\right)-5+20x\)

\(=3x^2-6x+3-x^2-2x-1+2x^2-18-\left(4x^2+12x+9\right)-5+20x\)

\(=4x^2-8x-16-5+20x-4x^2-12x-9\)

\(=-30\)

b: \(B=5x\left(x^2-49\right)-x\left(4x^2-4x+1\right)-\left(x^3+4x^2-246x\right)-175\)

\(=5x^3-245x-4x^3+4x^2-x-x^3-4x^2+246x-175\)

\(=-175\)

d: \(D=25x^2-20x+4-36x^2-12x-1+11\left(x^2-4\right)-48+32x\)

\(=-11x^2-32x+3-48+32x+11x^2-44\)

=-89