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11+1+11+1+11+1+11+1+11+1=60
11+1+11+1+11+1+11+1+11+1=60
11+1+11+1+11+1+11+1+11+1=60
60 hết
mik nanh nhat
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=(1/11+10/11)+(2/11+9/11)+(3/11+8/11)+(4/11+7/11)+(5/11+6/11)
=11/11+11/11+11/11+11/11+11/11
=1+1+1+1+1
=5
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a) 1/11 + 2/11 + 3/11 + ... + 10/11
= 1 + 2 + 3 + ... + 10 / 11
= (1 + 10).10:2 / 11
= 11.5/11
= 5
b) 1/10×20 + 1/20×30 + 1/30×40 + ... + 1/90×100
= 1/10×10 × (1/1×2 + 1/2×3 + 1/3×4 + ... + 1/9×10)
= 1/100 × (1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/9 - 1/10)
= 1/100 × (1 - 1/10)
= 1/100 × 9/10
= 9/1000
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{11}+\frac{2}{11}+\frac{3}{11}+\frac{4}{11}+...+\frac{10}{11}\)
\(=\frac{1+2+3+4+...+10}{11}\)
\(=\frac{\frac{10\times\left(10+1\right)}{2}}{11}\)
\(=\frac{55}{11}=5\)
\(\frac{1}{11}+\frac{2}{11}+\frac{3}{11}+\frac{4}{11}+...+\frac{10}{11}=\frac{1+2+3+4+...+10}{11}=\frac{55}{11}=5\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
`11/12 + 11/276 + 11/782 + ..... + 11/8900 `
`= 11/(1.12) + 11/(12.23) + ....+ 11/(89.100)`
`= 1/1 - 1/12 + 1/12 - 1/23 + ..... + 1/89 - 1/100`
`= 1 - 1/100 `
`= 99/100`
m là Ánh - con đũy bthân tao?(nếu k phải thì cho mình xin lỗi ạ)
11-75453415312652
= -75453415312641
-7,5453415e+13