求过程(2x-y)(2x+y)+2x(x-2y) (x/2+3)²-(x/2-3)² (2a-b)²-4(a+b)(a-2b)
问题描述:
求过程(2x-y)(2x+y)+2x(x-2y) (x/2+3)²-(x/2-3)² (2a-b)²-4(a+b)(a-2b)
答
原式=x²-4y²+4x²-y²
=5x²-5y²
答
(2x-y)(2x+y)+2x(x-2y) =4x²-y²+2x²-4xy=6x²-4xy-y²(x/2+3)²-(x/2-3)² =(x/2+3+x/2-3)(x/2+3-x+3)=6x(2a-b)²-4(a+b)(a-2b)=4a²-4ab+b²-4(a²-ab-2b²)=...