化简 (3)根号x-y分之x+y (x大于y大于0) (4)根号a²b-2ab+b的三次方 (b大于a大于0) (5)根

问题描述:

化简 (3)根号x-y分之x+y (x大于y大于0) (4)根号a²b-2ab+b的三次方 (b大于a大于0) (5)根
(3)根号x-y分之x+y (x大于y大于0)
(4)根号a²b-2ab+b的三次方 (b大于a大于0)
(5)根号a²分之1+b²分之1 (a大于0,b大于0)

(3)√[(x+y)/(x-y)]=[√(x²-y²)]/(x-y)(4)我觉得你这题该是√(a²b-2ab²+b³)=√[b(a-b)²]=(b-a)√b(5)√[(1/a²)+(1/b²)]=[√(a²+b²)]/(ab)因为一些括号是我认为是...