Question

Bài1:Làm tính nhân:

a) 2x. (x²– 7x -3)                 b) ( -2x³+ y²-7xy). 4xy²                   c)(-5x³).(2x²+3x-5)

d)(x²-2x+3). (x-4)                e) ( 2x³-3x -1). (5x+2)                  g) 3(2x-1)-5(x-3)    

Answer 1

\(a,=2x^3-14x^2-6x\\ b,=-8x^4y^2+4xy^4-28x^2y^3\\ c,=-10x^5-15x^4+25x^3\\ d,=x^3-4x^2-2x^2+8x+3x-12=x^3-6x^2+11x-12\\ e,=10x^4+4x^3-15x^2-6x-5x-2=10x^4+4x^3-15x^2-11x-2\\ g,=6x-3-5x+15=x+12\)