`\sqrt{8}+3\sqrt{50}-\sqrt{98}`
`=\sqrt{8.2}+3\sqrt{25.2}-\sqrt{49.2}`
`=\sqrt{2^2. 2}+3\sqrt{5^2. 2}-\sqrt{7^2. 2}`
`=2\sqrt{2}+3.5\sqrt{2}-7\sqrt{2}`
`=2\sqrt{2}+15\sqrt{2}-7\sqrt{2}`
`=17\sqrt{2}-7\sqrt{2}`
`=10\sqrt{2}.`
Đáp án+Giải thích các bước giải:
$\sqrt{8}$+3$\sqrt{50}$-$\sqrt{98}$
`=`$\sqrt{4.2}$ +`3`$\sqrt{2.25}$-$\sqrt{2.49}$
`=`$\sqrt{2^2.2}$ +`3`$\sqrt{2.5^2}$-$\sqrt{2.7^2}$
`=2`$\sqrt{2}$ +`15`$\sqrt{2.5}$-`7`$\sqrt{2.7}$
`=17`$\sqrt{2}$ -`7`$\sqrt{2.7}$
`=10`$\sqrt{2}$
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