Tìm x
7x - 10 = 2 mũ 7 : 2 mũ 5
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3+2.[x-2]=2^3-(-1)
=5.[x-2]=15
=15:5
=3
=>x=3+2=5
\(3+2\left|x-2\right|=2^3-\left(-1\right)\)
\(\Rightarrow3+2\left|x-2\right|=9\)
\(\Rightarrow2\left|x-2\right|=6\)
\(\left|x-2\right|=3\)
\(\hept{\begin{cases}x=5\\x=-1\end{cases}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\)\(M=2+2^2+2^3+2^4+...+2^{2017}+2^{2018}\)
\(2M=2^2+2^3+2^4+2^5+....+2^{2018}+2^{2019}\)
\(M=2^{2019}-2\)
\(b,\)\(M=2+2^2+2^3+2^4+....+2^{2017}+2^{2018}\)
\(=\left(2+2^2\right)+\left(2^3+2^4\right)+....+\left(2^{2017}+2^{2018}\right)\)
\(=2\left(2+1\right)+2^3\left(2+1\right)+....+2^{2017}\left(2+1\right)\)
\(=3\left(2+2^3+...+2^{2017}\right)⋮3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x-36:18=12-15\)
\(\Rightarrow x-2=-3\)
\(\Rightarrow x=-1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2^{111}=\left(2^3\right)^{37}=8^{37}\)
\(3^{77}>3^{74}=\left(3^2\right)^{37}=9^{37}\)
Vì \(8^{37}< 9^{37}\Rightarrow2^{111}< 9^{37}< 3^{77}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(124+\left|-3\right|-\left|-5\right|\)
\(=124+3-5\)
\(=124+\left(3-5\right)\)
\(=124+\left(-2\right)\)
\(=124-2\)
\(=122\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đó là hút nước , muối khoáng và chất dinh dưỡng để nuôi cây .
7x-10=2 mũ 2
7x-10=4
7x=14
x=2
7x - 10 = 27 : 25
=> 7x - 10 = 22
=> 7x - 10 = 4
=> 7x = 14
=> x = 2