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数学
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已知X的2N次=5,求(2X的3N次)的2次—3(3X的N次)的4次的值.
人气:108 ℃ 时间:2020-04-08 18:13:31
解答
已知x^(2n)=5
求[2x^(3n)]^2-3[3x^n]^4
=2^2[x^(2n)]^3-3^5[x^(2n)]^2
=4*5^3-243*5^2
=4*125-243*25
=500-6075=-5575
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