计算:(1)[x(x2y2-xy)-y(x2-x3y)]÷3x2y;(2)已知:xm=3,xn=2,求x3m+2n.
题型:解答题难度:一般来源:不详
计算: (1)[x(x2y2-xy)-y(x2-x3y)]÷3x2y; (2)已知:xm=3,xn=2,求x3m+2n. |
答案
(1)原式=(x3y2-x2y-x2y+x3y2)÷3x2y =(2x3y2-2x2y)÷3x2y =xy-;
(2)∵xm=3,xn=2, ∴x3m+2n=(xm)3•(xn)2=27×4=108. |
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