设x^2n=3,求(1/3x^3n)·[4(x^5)^n]急
问题描述:
设x^2n=3,求(1/3x^3n)·[4(x^5)^n]急
答
1/27x^9n·4x^5n
=4/27x^14n
=4/27x3^7
=324
我都写过了,这保证对!
答
约分式子化简得 (1/3x^3n) * 4x^(2n+3n)=1/3*4*x^2n=4
答
答案是4,先约分啊,4(x^5)^n可以化成4(x^5n)或
4x^[(2n+3n)]这样3x^3n与4x^[(2n+3n)])约分,它们都有x^3n,这样就得4