`\text{Đáp án+ Giải thích các bước giải:}`
`a)``\sqrt{-3x+2}`
`\text{ĐK: }-3x+2>=0<=>-3x>=-2<=>x<=2/3`
`b)` `\sqrt{x+5}`
`\text{ĐK: }x+5>=0<=>x>=-5`
`c)` `\sqrt{4-5x}`
`\text{ĐK: }4-5x>=0<=>-5x>=-4<=>x<=4/5`
`d)` `\sqrt{(-3)/{2x-1}}`
`\text{ĐK: }(-3)/{2x-1}>=0<=>2x-1<=0<=>2x<=1<=>x<1/2`
`e)` `\sqrt{(x-1)(x^2+2)}`
`\text{Vì: }x^2>=0=>x^2+2>0`
`\text{ĐK: }(x-1)(x^2+2)>=0<=>x-1>=0<=>x>=1`