2 câu trả lời
`#tnvt`
`A=\sqrt{2}-\sqrt{45}+3\sqrt{18}+\sqrt{72}`
`=\sqrt{2}-\sqrt{3^2 .5}+3\sqrt{3^2 .2}+\sqrt{6^2 .2}`
`=\sqrt{2}-3\sqrt{5}+9\sqrt{2}+6\sqrt{2}`
`=16\sqrt{2}-3\sqrt{5}`
`A=\sqrt{2}-\sqrt{45}+3\sqrt{18}+\sqrt{72}`
`=\sqrt{2}-\sqrt{9.5}+3\sqrt{9.2}+\sqrt{36.2}`
`=\sqrt{2}-3\sqrt{5}+9\sqrt{2}+6\sqrt{2}`
`=16\sqrt{2}-3\sqrt{5}`
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