> 数学 >
若n为正整数,且x^2n=5,求(x^3n)^2-13(x^2)^2n的值
人气:372 ℃ 时间:2020-06-04 00:32:21
解答
(x^3n)^2-13(x^2)^2n
=x^(6n)-13x^(4n)
=(x^2n)^3-13(x^2n)^2
=5^3-13*5^2
=125-13*25
=125-325
=-200
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版