a) `\sqrt{96*125}`
`=\sqrt{96}.\sqrt{125}`
`=4\sqrt{6}.5\sqrt{5}`
`=20\sqrt{30}`
b) `\sqrt{a^4b^5}`
`=\sqrt{a^4}.\sqrt{b^5}`
`=a^2\sqrt{b^5}`
c) `\sqrt{a^6b^11}` (ĐKXĐ: `a>0`)
`=\sqrt{a^6}.\sqrt{b^11}`
`=a^3\sqrt{b^11}`
d) `\sqrt{a^3(1-a^4)` (ĐKXĐ: `a>1`)
`=\sqrt{a^3}.\sqrt{1-a^4}`
`=\sqrt{a^3}.\sqrt{(1-a^2)(1+a^2)}`