(1)a2•(-2a2)2÷a3-2a3; (2)(x-y)•(x-y)3•(y-x); (3)(2x-1)(2x+1)(4x2+1); (4)(a-b)2-2(a-b)(a+b)+(a+b)2.
问题描述:
(1)a2•(-2a2)2÷a3-2a3;
(2)(x-y)•(x-y)3•(y-x);
(3)(2x-1)(2x+1)(4x2+1);
(4)(a-b)2-2(a-b)(a+b)+(a+b)2.
答
(1)原式=a2•4a4÷a3-2a3=4a3-2a3=2a3;
(2)原式=-(x-y)5;
(3)原式=(4x2-1)(4x2+1)=16x4-1;
(4)原式=(a-b-a-b)2=4b2.