( 15 - x ) + 2 =12 bằng bao nhiêu
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\(\left(15-x\right)+2=12\)
\(15-x=12-2\)
\(15-x=10\)
\(x=15-10\)
\(x=5\)
\(\dfrac{1}{2}:\dfrac{3}{8}-0,25\times\dfrac{8}{5}\)
\(=\dfrac{1}{2}\times\dfrac{8}{3}-\dfrac{1}{4}\times\dfrac{8}{5}\)
\(=\dfrac{4}{3}-\dfrac{2}{5}=\dfrac{20}{15}-\dfrac{6}{15}=\dfrac{14}{15}\)
`sqrt{10 + 4sqrt{6}}`
`=sqrt{10 + 2. 2sqrt{6}}`
`=sqrt{sqrt{6}^2 + 2. 2sqrt{6} + 2^2}`
`=sqrt{(sqrt{6}+ 2)^2}`
`= sqrt{6}+ 2`
\(\sqrt{10+4\sqrt{6}}=\sqrt{4.\dfrac{5}{2}+4\sqrt{6}}=2\sqrt{\dfrac{5\sqrt{6}}{2}}\)
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1 What time do you have lunch every day?
2 flies
3 draws
4 is
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1. What time do you (have) _____________have_________________________________lunch every day?
2. The plane (fly) __________flies__________________________________to London every Monday.
3. My friend often (draw) _______draws_______________________________________ nice posters.
4. London _______is_______ (be) a very big country
5. My father (not/read)_______doesn't read_____ the newspaper every morning.






(15 - x) + 2 = 12
=> 15 - x = 12 - 2
=> 15 - x = 10
=> x = 15 - 10
=> x = 5
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