问题
计算题
计算:
(1)(﹣3x2)3(﹣4y3)2÷(6x2y)3;
(2)(﹣x﹣y)2﹣(2y﹣x)(x+2y)
答案
解:(1)原式=﹣27x6(16y6)÷(216x6y3)=﹣2y3;
(2)原式=(﹣x﹣y)2﹣(2y﹣x)(x+2y),
=x2+2xy+y2﹣(4y2﹣x2),
=x2+2xy+y2﹣4y2+x2,
=2xy﹣3y2.
计算:
(1)(﹣3x2)3(﹣4y3)2÷(6x2y)3;
(2)(﹣x﹣y)2﹣(2y﹣x)(x+2y)
解:(1)原式=﹣27x6(16y6)÷(216x6y3)=﹣2y3;
(2)原式=(﹣x﹣y)2﹣(2y﹣x)(x+2y),
=x2+2xy+y2﹣(4y2﹣x2),
=x2+2xy+y2﹣4y2+x2,
=2xy﹣3y2.