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\(=\left(-0,37+\frac{14}{8}\right).\left(-1.1\right)-\left(2,63-\frac{9}{24}\right).\left(-1,1\right)\)
\(=-1,1.\left(-0,37+\frac{14}{8}-2,63+\frac{9}{24}\right)\)
\(=-1,1.\left[\left(-0,37-2,63\right)+\left(\frac{14}{8}+\frac{9}{24}\right)\right]\)
\(=-1,1.\left[\left(-3\right)+\left(\frac{14}{8}+\frac{3}{8}\right)\right]\)
\(=-1,1.\left(-3+\frac{17}{8}\right)\)
\(=-1,1.\left(-\frac{7}{8}\right)\)
\(=\frac{77}{80}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,03 : -5/7 - 6,87. 7/5 + 1,1 . ( -1,4 )
= -0,03 . 7/5 -6,87 . 7/5 + 1,1 . ( - 1,4 )
= -7/5 . ( -0,03 - 6,87 ) + 1,1 .( -1,4 )
= -1,4 . -6,9 + 1,1 . ( -1,4 )
= -1,4 . ( -6,9 + 1,1 )
= -1,4 . (-5,8 )
= 8,12
nhớ k và kết bạn vs mik nha
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a) \(\left|x\right|-\frac{3}{4}=\frac{5}{3}\)
\(\left|x\right|=\frac{5}{3}+\frac{3}{4}\)
\(\left|x\right|=\frac{29}{12}\)
\(\orbr{\begin{cases}x=\frac{29}{12}\\x=-\frac{29}{12}\end{cases}}\)
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\(\frac{\frac{1}{3}+\frac{1}{9}-\frac{1}{27}}{\frac{5}{3}+\frac{5}{9}-\frac{5}{27}}=\frac{\frac{9}{27}+\frac{3}{27}-\frac{1}{27}}{\frac{45}{27}+\frac{15}{27}-\frac{5}{27}}=\frac{\frac{9+3-1}{27}}{\frac{45+15-5}{27}}=\frac{\frac{11}{27}}{\frac{55}{27}}=\frac{11}{55}=\frac{1}{5}.\)
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\(x:\left(1,1x-9\right).\frac{1}{5}=40\%\)
\(x:\left(1,1x-9\right)=2\)
\(x=2.\left(1,1x-9\right)\)
\(x=2,2x-18\)
\(-1,2x=-18\)
\(x=15\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\dfrac{1}{3}+\dfrac{1}{15}+\dfrac{1}{35}+...+\dfrac{1}{97\times99}\)
\(=\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+...+\dfrac{1}{97.99}\)
\(=\dfrac{1}{2}.\left(\dfrac{2}{1.3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{97.99}\right)\)
\(=\dfrac{1}{2}.\left(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{97}-\dfrac{1}{99}\right)\)
\(=\dfrac{1}{2}.\left(1-\dfrac{1}{99}\right)\)
\(=\dfrac{1}{2}.\dfrac{98}{99}\)
\(=\dfrac{49}{99}\)
dấu \(.\) là dấu \(\times\)
\(\left(1,1.x-9\right).\left|\frac{-1}{5}\right|=40\%\)
\(\left(\frac{11}{10}.x-9\right).\frac{1}{5}=\frac{2}{5}\)
\(\frac{11}{10}.x-9=\frac{2}{5}:\frac{1}{5}\)
\(\frac{11}{10}.x-9=2\)
\(\frac{11}{10}.x=2+9\)
\(\frac{11}{10}.x=11\)
\(x=11:\frac{11}{10}\)
\(x=10\)
\(\left(\frac{11}{10}x-9\right)\times\frac{1}{5}=\frac{2}{5}\)
\(\left(\frac{11}{10}x-9\right)=\frac{2}{5}:\frac{1}{5}\)
\(\left(\frac{11}{10}x-9\right)=2\)
\(\frac{11}{10}x=2+9\)
\(\frac{11}{10}x=11\)
\(x=11:\frac{11}{10}=10\)