\(\frac{19}{13}\)-\(\frac{6}{13}\)+(-11) ....................
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1.Do you parents speak English.
v My parents speak English.
2.Sarah studies geography.
? Does Sarah study geography?
3.Does Rischard live in London?
x Rischard doesn't live in London.
4. Mr.Baker doesn't watch the news on TV
v Mr.Barker watches the news on TV.
5.Those children don't do enough homework?
? Do those children do enough homework?
6.My brother drinks fruit juice at break fast.
x My brother doesn't drinks fruit juice at break fast.
1.Your parents speak English.
2.Does Sarah study geography?
3.Rischard doesn't live in London.
4.Mr.Baker watches the news on TV.
5.Do those children do enough homework?
6.My brother doesn't drink fruit juice at breakfast.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{1}{99}-\frac{1}{99.98}-\frac{1}{98.97}-\frac{1}{97.96}-...-\frac{1}{2.1}\)
\(=\frac{1}{99}-\left(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{97.98}+\frac{1}{98.99}\right)\)
\(=\frac{1}{99}-\left(\frac{2-1}{1.2}+\frac{3-2}{2.3}+...+\frac{98-97}{97.98}+\frac{99-98}{98.99}\right)\)
\(=\frac{1}{99}-\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{97}-\frac{1}{98}+\frac{1}{98}-\frac{1}{99}\right)\)
\(=\frac{1}{99}-\left(1-\frac{1}{99}\right)\)
\(=\frac{-97}{99}\)
Trả lời
\(\frac{19}{13}\)- \(\frac{6}{13}\)+ (-11) = 1 + (-11) = -10
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