`1)\sqrt{3x}=6<=>3x=36<=>x=12`
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`2)\sqrt{5x}=\sqrt{10}<=>5x=10<=>x=2`
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`3)\sqrt{4-5x}=12<=>4-5x=144<=>x=-28`
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`4)\sqrt{1-4x+4x^2}=5`
`<=>|1-2x|=5`
`<=>[(1-2x=5),(1-2x=-5):}<=>[(x=-2),(x=3):}`
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`5)\sqrt{4x-20}+\sqrt{x-5}-1/3\sqrt{9x-45}=4` `ĐK: x >= 5`
`<=>2\sqrt{x-5}+\sqrt{x-5}-\sqrt{x-5}=4`
`<=>\sqrt{x-5}=2`
`<=>x-5=4`
`<=>x=9` (t/m)
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`6)1/2\sqrt{x-1}-3/2\sqrt{9x-9}+24\sqrt{[x-1]/64}=-17` `ĐK: x >= 1`
`<=>1/2\sqrt{x-1}-9/2\sqrt{x-1}+3\sqrt{x-1}=-17`
`<=>\sqrt{x-1}=17`
`<=>x-1=289`
`<=>x=290` (t/m)
