题目内容
计算题:
(1)(-a2)3+(-a3)2-a2•a4+2a9÷a3
(2)(4x-y)2
(3)(x+3)(x2+9)(x-3)
(4)(x+2y-3)(x-2y+3)
(1)(-a2)3+(-a3)2-a2•a4+2a9÷a3
(2)(4x-y)2
(3)(x+3)(x2+9)(x-3)
(4)(x+2y-3)(x-2y+3)
(1)原式=-a6+a6-a6+2a6=a6;
(2)原式=16x2-8xy+y2;
(3)原式=(x+3)(x-3)(x2+9)=(x2-9)(x2+9)=x4-81;
(4)原式=x2-(2y-3)2=x2-4y2+12xy-9.
(2)原式=16x2-8xy+y2;
(3)原式=(x+3)(x-3)(x2+9)=(x2-9)(x2+9)=x4-81;
(4)原式=x2-(2y-3)2=x2-4y2+12xy-9.
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