计算:(1)(x+y) 2 (x-y) 2 -(x-y)(x+y)(x 2 +y 2 );(2)(2x-3)(x-2)-2(x-1) 2 ;(3
计算:(1)(x+y)2(x-y)2-(x-y)(x+y)(x2+y2);(2)(2x-3)(x-2)-2(x-1)2;(3)[(x-y)2+(x+y)2](x2-2y2...
计算:(1)(x+y) 2 (x-y) 2 -(x-y)(x+y)(x 2 +y 2 );(2)(2x-3)(x-2)-2(x-1) 2 ;(3)[( x-y) 2 +( x+y) 2 ]( x 2 -2y 2 );(4)(a+1)(a+2)(a+3)(a+4);
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