Đáp án:
$\dfrac{-12+12\sqrt[]{6}}{5}$
Giải thích các bước giải:
$\dfrac{12}{\sqrt[]{7+\sqrt[]{24}}}$
$=\dfrac{12}{\sqrt[]{7+\sqrt[]{2^2.6}}}$
$=\dfrac{12}{\sqrt[]{7+2\sqrt[]{6}}}$
$=\dfrac{12}{\sqrt[]{(\sqrt[]{6}+1)^2}}$
$=\frac{12}{|\sqrt[]{6}+1|}$
$=\frac{12}{\sqrt[]{6}+1}$
$=\dfrac{12(\sqrt[]{6}-1)}{(\sqrt[]{6}+1)(\sqrt[]{6}-1)}$
$=\dfrac{-12+12\sqrt[]{6}}{5}$
Đáp án + Giải thích các bước giải:
`12/(sqrt(7+sqrt(24)))=12/(sqrt(7+sqrt(2^2 . 6))`
`=12/(sqrt(7+2sqrt(6)))=12/(sqrt(6+2sqrt(6)+1))`
`=12/(sqrt((sqrt(6)+1)^2))=12/(sqrt(6)+1)`
`=(12(sqrt(6)-1))/((sqrt(6)-1)(sqrt(6)+1))`
`=(-12+12sqrt(6))/5`
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III. Rewrite the second sentences, keeping the meaning unchanged: 1. They will use solar energy to protect the environment. -> Solar energy ………………………………………………………………….. 2. Although she eats lots of food, she is still very slim. ->In spite of ………………………………………………………………….. 3. What is the distance between Hanoi and HCM city? -> How far …………………………………………………………………..? 4. Although she is so young, she sings beautifully (age) -> In spite of ………………………………………………………………….. 5. I find English interesting. -> I am …………………………………………………..… 6. Our roof will be fixed tomorrow. -> They…………………………………………………….. 7. They will show flying cars to the public when they finish it. -> Flying cars …………………………………………………………………….. 8. They will install solar panels on the roof of our house next week. -> Solar panels …………………………………………………………………………………… 9. We will be using biogas for cooking and heating at this time next month. -> Biogas ……………………………………………………………………………………………... 10. People won’t burn fossil fuels for energy in the future. -> Fossil fuels …………………………………………………………………………………… Giúp mình nhanh nhé
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