求大神帮帮忙,要具体过程,谢谢!

2024-11-09 09:45:30
推荐回答(3个)
回答1:

首先把x^(-2/3)提取出来
y=1/3*x^(-2/3)*(1+(1-2/3(x-1)x^(-1))
=1/3*x^(-2/3)*(1+(1-2/3(1-x^(-1))
=1/3*x^(-2/3)*(1+1-2/3+2/3x^(-1))
=1/3*x^(-2/3)*(4/3+2/3x^(-1)) 最后一个括号里通分
=1/3*x^(-2/3)*((4x+2)/3x)
= (4x+2)/(9x*x^(-2/3)) 即是答案

回答2:

回答3: