(2a-5b)(3a的二次方-2ab+b的二次方)2(x-2)(x+3)-5(x-3)(x+8)(5x-5)(2x+3)-2(3x-5)(4x-1)

问题描述:

(2a-5b)(3a的二次方-2ab+b的二次方)
2(x-2)(x+3)-5(x-3)(x+8)
(5x-5)(2x+3)-2(3x-5)(4x-1)

(2a-5b)(3a的二次方-2ab+b的二次方)
=6a³-4a²b+2ab²-15a²b+10ab²-5b³
=6a³-19a²b+12ab²-5b³
2(x-2)(x+3)-5(x-3)(x+8)
=2(x²+x-6)-5(x²+5x-24)
=2x²+2x-12-5x²-25x+120
=-3x²-23x+108
(5x-5)(2x+3)-2(3x-5)(4x-1)
=5(2x²+x-3)-2(12x²-23x+5)
=10x²+5x-15-24x²+46x-10
=-14x²+51x-25