Question

请问这道数学14题圈着的地方是如何得到的呢？

最好是手写的，谢谢

Answer 1

就是合并同类项得到的:
(√x)^(6-r)(1/x)^r
=x^(3-r/2)x^(-r)
=x^(3-r/2-r)
=x(3-3r/2)

Answer 2

√X^(6-r)×(1/X)^r
=X^(6-r)/2×X^(-r)
=X^(3-r/2)×X^(-r)
=X^(3-r/2-r)
=X^(3-3r/2)