计算:(1)(a3)2÷(a2)3 (2)(x-y)(x2-xy+y2)
题型:解答题难度:一般来源:不详
计算: (1)(a3)2÷(a2)3 (2)(x-y)(x2-xy+y2) |
答案
(1)原式=a6÷a6=1; (2)原式=x3-x2y+xy2-x2y+xy2-y3=x3-2x2y+2xy2-y3. |
举一反三
先化简,再求值:(a2b+2ab2-b3)÷b-(a-b)(a+b),其中a=,b=-6. |
先化简,再求值:3(a-1)2-(2a+1)(a-2),其中a=-. |
(1)计算:(y+2)(y-2)-(y-1)(y+5); (2)已知2x-y=10,求[(x2+y2)-(x-y)2+2y(x-y)]÷y的值. |
先化简,再求值:(x-2)2+(3+x)(3-x),其中x=-1. |
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