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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(6585\)
* Giai thich :
Vi so chia het cho 5 thi hang don vi se la 0 hoac 5 , 0 < 5 nen hang don vi la 5. Roi ta cong 6 + 5 + 5 = 16. Ta thay them so 8 la 24 , 24 chia het cho 3 ( neu chon tong cac chu so la 27 thi ko co chu so thoa man ) nen so 8 la thoa man. So do la \(6585.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(P=\frac{1}{2^2}+\frac{1}{2^3}+\frac{1}{2^4}+...+\frac{1}{2^{100}}\)
\(2P=\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{99}}\)
\(2P-P=\left(\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{99}}\right)-\left(\frac{1}{2^2}+\frac{1}{2^3}+\frac{1}{2^4}+...+\frac{1}{2^{100}}\right)\)
\(P=\frac{1}{2}-\frac{1}{2^{100}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-5x+2=-5x+15-13=-5\left(x-3\right)-13⋮\left(x-3\right)\)
\(\Leftrightarrow13⋮\left(x-3\right)\Leftrightarrow x-3\inƯ\left(13\right)=\left\{-13,-1,1,13\right\}\)
\(\Leftrightarrow x\in\left\{-10,2,4,16\right\}\).
Xx(98-48)=1850
Xx50=1850
X=1850:50
X=37