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\(\left(\frac{13}{84}.\frac{7}{5}-\frac{5}{2}.\frac{7}{180}\right):\frac{43}{18}+\frac{9}{2}.\frac{1}{10}\)
\(=\frac{43}{360}:\frac{43}{18}+\frac{9}{20}=\frac{1}{20}+\frac{9}{20}=\frac{10}{20}=\frac{1}{2}\)
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\(225:15+3\left(2x-1\right)=270\)
\(\Leftrightarrow2x-1=85\)
hay x=43
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\(\frac{3}{2}X\frac{1}{3}+\frac{8}{5}:4\)
= \(\frac{1}{2}+\frac{8}{5}X\frac{1}{4}\)
= \(\frac{1}{2}+\frac{2}{5}\)
\(=\frac{5}{10}+\frac{4}{10}\)
\(=\frac{9}{10}\)
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\(\frac{1}{1}\cdot\frac{1}{2}+\frac{1}{2}\cdot\frac{1}{3}+\frac{1}{3}\cdot\frac{1}{4}+...+\frac{1}{79}\cdot\frac{1}{80}\)
\(=\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+...+\frac{1}{79\cdot80}\)
\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}+...+\frac{1}{79}-\frac{1}{80}\)
\(=1-\frac{1}{80}\)
\(=\frac{79}{80}\)
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10^2x1=100
tích mình mình tích lại
102x1=100x1=100
đúng 100%
nha