2 phần 3 trừ 2 phần 7
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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) \(x:\frac{6}{5}+\frac{2}{3}=\frac{7}{3}\)
\(\Leftrightarrow x:\frac{6}{5}=\frac{7}{3}-\frac{2}{3}\)
\(\Leftrightarrow x:\frac{6}{5}=\frac{5}{3}\)
\(\Leftrightarrow x=\frac{5}{3}.\frac{6}{5}\)
\(\Leftrightarrow x=2\)
\(\frac{3}{7}.\frac{261}{3}-\frac{3}{7}.\frac{191}{3}-\frac{2}{5}\)
\(=\frac{3}{7}.\left(\frac{261}{3}-\frac{191}{3}\right)-\frac{2}{5}\)
\(=\frac{3}{7}.\frac{70}{3}-\frac{2}{5}\)
\(=10-\frac{2}{5}\)
\(=\frac{48}{5}\)
\(\frac{6}{7}+\frac{2}{5}-\frac{1}{2}+2\frac{38}{91}-\frac{4}{5}=\frac{27300}{31850}+\frac{12740}{31850}-\frac{15925}{31850}+\) \(2\frac{13300}{31850}\)\(-\frac{25480}{31850}\)
\(=2\frac{27300+12740-15925+13300-25480}{31850}\)\(=2\frac{341}{910}\)
HỌC TỐT!!!
\(\dfrac{7}{2}-\dfrac{3}{2}x=\dfrac{11}{2}\\ \dfrac{3}{2}x=\dfrac{7}{2}-\dfrac{11}{2}\\ \dfrac{3}{2}x=-2\\ x=-2:\dfrac{3}{2}\\ x=\dfrac{-4}{3}\)
\(\dfrac{7}{2} - \dfrac{3}{2}x = \dfrac{11}{2}\)
\( \dfrac{3}{2}x = \dfrac{7}{2} - \dfrac{11}{2}\)
\( \dfrac{3}{2}x = \dfrac{-4}{2}\)
\( \dfrac{3}{2}x = -2\)
\(x = -2 : \dfrac{3}{2}\)
\(x = -2 . \dfrac{2}{3} \)
\(x = \dfrac{-4}{3} \)
Vậy \(x = \dfrac{-4}{3} \)
2/3-2/7=8/21
2/3-2/7=8/21 nha
~HT~
k cho mình nha
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