已知xn=5,yn=3,求:(1)(x2y)2n;(2)x3n÷y4n.

问题描述:

已知xn=5,yn=3,求:(1)(x2y)2n;(2)x3n÷y4n

(1)∵xn=5,yn=3,
∴(x2y)2n=x4ny2n=(xn4(yn2=54×32=5625;
(2)∵xn=5,yn=3,
∴x3n÷y4n=(xn3÷(yn4=53÷34=

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