3/5 off ..... = ...........
giúp mk với
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\(\frac{7}{6}+\frac{5}{6}:5-\frac{3}{8}.\left(-3\right)^2\)
\(=\frac{7}{6}+\frac{5}{6}.\frac{1}{5}-\frac{3}{8}.9\)
\(=\frac{7}{6}+\frac{1}{6}-\frac{27}{8}\)
\(=\frac{8}{6}-\frac{27}{8}\)
\(=\frac{32}{24}-\frac{81}{24}\)
\(=\frac{-49}{24}\)
Chúc bạn học tốt !!!
\(-12(x-5)+7(3-x)=5\)
\(\Rightarrow-12x-60+21-7x=5\)
\(\Rightarrow-12x-7x-60+21=5\)
\(\Rightarrow-12x-7x-81=5\)
\(\Rightarrow-19x-81=5\)
\(\Rightarrow81-19x=5\)
\(\Rightarrow-19x=-76\)
\(\Rightarrow x=4\)
-12(x-5)+7(3-x)=5
-12x-(-12.5)+7.3-7x=5
-12x-(-60)+21-7x=5
-12x-(-60)+21=5+7x
-12x-(-60)=5+7x-21
-12x=5+7x-21+(-60)
-12x-7x=5-21+(-60)
-19x=-76
x=-76:(-19)
x=4
vậy x=4
\(\left(\frac{3}{5}-\frac{2}{3}x\right)^3=\left(\frac{-4}{5}\right)^3\)
\(\frac{3}{5}-\frac{2}{3}x=\frac{-4}{5}\)
\(\frac{2}{3}x=\frac{7}{5}\)
\(x=\frac{21}{10}\)
\(\left(\frac{3}{5}-\frac{2}{3}.x\right)^3=\frac{-64}{125}\)
\(\Leftrightarrow\left(\frac{3}{5}-\frac{2}{3}.x\right)^3=\left(-\frac{4}{5}\right)^3\)
\(\Rightarrow\frac{3}{5}-\frac{2}{3}.x=-\frac{4}{5}\)
\(\Leftrightarrow\frac{2}{3}.x=\frac{3}{5}-\left(-\frac{4}{5}\right)\)
\(\Leftrightarrow\frac{2}{3}.x=\frac{3}{5}+\frac{4}{5}\)
\(\Leftrightarrow\frac{2}{3}.x=\frac{7}{5}\)
\(\Leftrightarrow x=\frac{7}{5}:\frac{2}{3}\)
\(\Leftrightarrow x=\frac{21}{10}\)
Vậy \(x=\frac{21}{10}\)
\(\left(\frac{3}{5}-\frac{2}{3}x\right)^3=\frac{-64}{125}\)
\(\left(\frac{3}{5}-\frac{2}{3}x\right)^3=\left(\frac{-4}{5}\right)^3\)
\(\frac{3}{5}-\frac{2}{3}x=\frac{-4}{5}\)
\(\frac{9}{15}-\frac{10x}{15}=\frac{-12}{15}\)
\(-\frac{10x}{15}=\frac{9}{15}-\frac{-12}{15}\)
\(\text{ }-10x=9+12\)
\(-10x=21\)
\(x=\frac{-21}{10}\)
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