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Đề là tìm x?
\(x-\frac{4}{5}:\frac{2}{7}=\frac{8}{35}\)
\(x-\frac{4}{5}\times\frac{7}{2}=\frac{8}{35}\)
\(x-\frac{4\times7}{5\times2}=\frac{8}{35}\)
\(x-\frac{28}{10}=\frac{8}{35}\)
\(x=\frac{8}{35}+\frac{28}{10}\)
\(x=\frac{16}{70}+\frac{196}{70}\)
\(x=\frac{16+196}{70}\)
\(x=\frac{212}{70}=\frac{106}{35}\)
Vậy x = 106/35
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{3}{2}-\frac{5}{6}:x=\frac{5}{15}-\frac{3}{15}\)
\(\Leftrightarrow\frac{3}{2}-\frac{5}{6}:x=\frac{2}{15}\)
\(\Leftrightarrow\frac{5}{6}:x=\frac{3}{2}-\frac{2}{15}\)
\(\Leftrightarrow\frac{5}{6}:x=\frac{41}{30}\)
\(\Leftrightarrow x=\frac{5}{6}:\frac{41}{30}\)
\(\Leftrightarrow x=\frac{25}{41}\)
b) \(x-\frac{6}{7}.\frac{14}{8}=\frac{1}{2}-\frac{2}{5}\)
\(\Leftrightarrow x-\frac{3}{2}=\frac{1}{10}\)
\(\Leftrightarrow x=\frac{1}{10}+\frac{3}{2}\)
\(\Leftrightarrow x=\frac{8}{5}\)
c) \(x:\frac{6}{5}+\frac{2}{3}=\frac{7}{3}\)
\(\Leftrightarrow x:\frac{6}{5}=\frac{7}{3}-\frac{2}{3}\)
\(\Leftrightarrow x:\frac{6}{5}=\frac{5}{3}\)
\(\Leftrightarrow x=\frac{5}{3}.\frac{6}{5}\)
\(\Leftrightarrow x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x-\frac{7}{8}:\frac{3}{4}=\frac{19}{16}\)
\(x-\frac{7}{6}=\frac{19}{16}\)
\(x=\frac{19}{16}+\frac{7}{6}\)
\(x=\frac{113}{48}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x-\frac{7}{8}\)\(\div\frac{3}{4}\)\(=\frac{19}{16}\)
\(x-\frac{7}{8}=\frac{19}{16}\times\frac{3}{4}\)
\(x-\frac{7}{8}=\frac{57}{64}\)
\(x=\frac{57}{64}+\frac{7}{8}\)
\(x=\frac{57}{64}+\frac{56}{64}\)
\(x=\frac{57+56}{64}\)
\(x=\frac{113}{64}\)
Học tốt!!!
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viết rõ lại cái đề giùm tui tui mới làm được
![](https://rs.olm.vn/images/avt/0.png?1311)
`\text {12 ngày 8 giờ - 2 ngày 15 giờ x 3 = 12 ngày 8 giờ - 7 ngày 21 giờ = 4 ngày 11 giờ}`
`11/12 \times 5/6 \times 4/3=55/72 \times 43=55/54`
`5/7+3/8 \div 9/2=5/7+1/12=67/84`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5\dfrac{3}{4}:3+2\dfrac{1}{4}\times\dfrac{1}{3}-\dfrac{1}{8}=\left(5\dfrac{3}{4}+2\dfrac{1}{4}\right)\times\dfrac{1}{3}-\dfrac{1}{8}\\ =8\times\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{8}{3}-\dfrac{1}{8}=\dfrac{61}{24}\\ ----\\ \dfrac{3}{5}:\dfrac{5}{6}:\dfrac{6}{7}:\dfrac{7}{8}+\dfrac{2}{5}+\dfrac{23}{35}\\ =\dfrac{3}{5}\times\dfrac{6}{5}\times\dfrac{7}{6}\times\dfrac{8}{7}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{18}{25}\times\dfrac{4}{3}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{353}{175}\)
\(x-\frac{4}{5}:\frac{2}{7}=\frac{8}{35}\)
\(x-\frac{4}{5}x\frac{7}{2}=\frac{8}{35}\)
\(x-\frac{14}{5}=\frac{8}{35}\)
\(x=\frac{8}{35}+\frac{14}{5}\)
\(x=\frac{8}{35}+\frac{89}{35}\)
\(x=\frac{97}{35}\)
# Chúc bạn học tốt #