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a ) 13/20
B)
C..........................................................
minh dang tính
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\(\frac{4}{5}\). X -X-\(\frac{3}{2}\). X+\(\frac{4}{3}\)
X.(\(\frac{4}{5}\)-1+\(\frac{4}{3}\))-3/2
X.17/15-3/2=-7/10
X.17/15 =4/5
X =12/17
k nhé
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\(\frac{3}{5}+\frac{2}{5}.\frac{-5}{3}-\frac{1}{15}=\frac{3}{5}+\frac{-2}{3}-\frac{1}{15}\)
\(=\frac{9}{15}+\frac{-10}{15}-\frac{1}{15}\)
\(=\frac{9-10-1}{15}=\frac{-2}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\left(2x+\frac{3}{4}\right)\frac{7}{9}=\frac{15}{8}\)
\(=2x+\frac{3}{4}\)\(=\frac{15}{8}:\frac{7}{9}\)
=\(2x+\frac{3}{4}=\frac{135}{56}\)
=2x=\(\frac{135}{56}-\frac{3}{4}\)
=2x=\(\frac{93}{56}\)
x=\(\frac{93}{56}:2\)
x=\(\frac{93}{112}\)
k nha