(5x+2)(x-2) -5(x+1)(x-3)怎么做
问题描述:
(5x+2)(x-2) -5(x+1)(x-3)怎么做
答
(5x+2)(x-2) -5(x+1)(x-3)
=5x^2-10x+2x-4-5(x^2-2x-3)
=5x^2-8x-4-5x^2+10x+15
=2x+11
答
(5x+2)(x-2) -5(x+1)(x-3)
=5x²+2x-10x-4-5(x²+x-3x-3)
=5x²-8x-4-5x²+10x+15
=2x+11