Question

Giúp em vs ạ

Answer 1

`1)` Căn thức có nghĩa `<=>1/2x-3 >= 0`

                                     `<=>1/2x >= 3<=>x >= 6`

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`2)`

`a)\sqrt{12}+\sqrt{48}-\sqrt{27}+3\sqrt{47}`

`=2\sqrt{3}+4\sqrt{3}-3\sqrt{3}+3\sqrt{47}`

`=3\sqrt{3}+3\sqrt{47}`

~~~~~~~~~~~~

`b)3/2\sqrt{6}+\sqrt{2/3}-5\sqrt{3/2}`

`=3/2\sqrt{6}+1/3\sqrt{6}-5/2\sqrt{6}`

`=-2/3\sqrt{6}`

~~~~~~~~~~~~

`c)\root[3]{-125}+\root[3]{343}-\root[3]{64}`

`=-5+7-4`

`=-2`