(4x-9y^(-1))/(2x^(1/2)+3y(-1/2))等于?SORRY 应该是(4x-9y^(-1))/(2x^(1/2_数学解答

(4x-9y^(-1))/(2x^(1/2)+3y(-1/2))等于?
SORRY 应该是(4x-9y^(-1))/(2x^(1/2)+3y^(-1/2))

人气：460 ℃　时间：2019-10-02 09:04:08

解答

[4x-9y^(-1)]/[2x^(1/2)+3y(-1/2)]
=[2x^(1/2)+3y(-1/2)][2x^(1/2)-3y(-1/2)]/[2x^(1/2)+3y(-1/2)]
=2x^(1/2)-3y(-1/2)