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1/9.10 - ( 1/1.2 + 1/2.3 +...+ 1/8 .9)
= 1/9 - 1/10 -( 1/1 - 1/2 + 1/2 - 1/3 +. ..+1/8 - 1 9/)
= 1/9 - 1/10 - ( 1 - 1/9 )
= 1/9 - 1/10 - 1 + 1/9
=-79/9
thang Tran làm cách giải đúng rồi, nhưng đáp số là -79/90 nha.
Dù sao cũng cám ơn bạn vì giúp mình hiểu bài.
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(M=\frac{1}{9.10}-\frac{1}{8.9}-\frac{1}{7.8}-\frac{1}{6.7}-\frac{1}{5.6}-...-\frac{1}{1.2}\)
\(\Rightarrow-M=-\left(\frac{1}{9.10}-\frac{1}{8.9}-\frac{1}{7.8}-...-\frac{1}{1.2}\right)\)
\(\Rightarrow-M=\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{7.8}+\frac{1}{8.9}-\frac{1}{9.10}\)
\(\Rightarrow-M=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}-\frac{1}{90}\)
\(\Rightarrow-M=1-\frac{1}{9}-\frac{1}{90}\)
\(\Rightarrow-M=\frac{8}{9}-\frac{1}{90}=\frac{80}{90}-\frac{1}{90}=\frac{79}{90}\)
\(\Rightarrow M=-\frac{79}{90}\)
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C = 1/(9.10) - 1/(8.9) - 1/(7.8) - ... - 1/(2.3) - 1/(1.2)
= 1/9 - 1/10 - 1/8 + 1/9 - 1/7 + 1/8 - ... - 1/2 + 1/3 - 1 + 1/2
= 1/9 - 1/10 + 1/9 - 1
= 2/9 - 11/10
= -79/90
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giữ nguyên tử / 3.5 . 6.2+6.3.2.7+3.7.8.2+3.8.2.9+3.9.2.10
rút gọn và tử còn 1 mawux còn 6+6+6+6+6 = 30
đáp số 1/30
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7/3.4 - 9/4.5 + 11/5.6 - 13/6.7 + 15/7.8 - 17/8.9 + 19/9.10
= 3+4/3.4 - 4+5/4.5 + 5+6/5.6 - 6+7/6.7 + 7+8/7.8 - 8+9/8.9 + 9+10/9.10
=1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 -1/6 - 1/7 +1/7 +1/8 - 1/8 - 1/9 + 1/9 + 1/10
=1/3 + 1/10=13/30
\(=\frac{6+1}{12}-\frac{10-1}{20}+\frac{10+1}{30}-\frac{14-1}{42}+\frac{14+1}{56}-\frac{18-1}{72}+\frac{18+1}{90}\)
=\(\frac{6}{12}+\frac{1}{12}-\frac{10}{20}+\frac{1}{20}+\frac{10}{30}+\frac{1}{30}-\frac{14}{42}+\frac{1}{42}+\frac{14}{56}+\frac{1}{56}-\frac{18}{72}+\frac{1}{72}+\frac{18}{90}+\frac{1}{90}\)
=\(\frac{1}{2}+\frac{1}{12}-\frac{1}{2}+\frac{1}{20}+\frac{1}{3}+\frac{1}{30}-\frac{1}{3}+\frac{1}{42}+\frac{1}{4}+\frac{1}{56}-\frac{1}{4}+\frac{1}{72}+\frac{1}{5}+\frac{1}{90}\)
\(=\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}+\frac{1}{5}\)
\(=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}+\frac{1}{6}\)
\(=\frac{1}{3}-\frac{1}{10}+\frac{1}{5}\)
\(=\frac{10}{30}-\frac{3}{30}+\frac{6}{30}=\frac{13}{30}\)
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