5 2/5 nhân 10 .Hỗn số
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\(\Leftrightarrow x\cdot\dfrac{12}{7}=\dfrac{15}{6}=\dfrac{5}{2}\)
hay \(x=\dfrac{5}{2}:\dfrac{12}{7}=\dfrac{5}{2}\cdot\dfrac{7}{12}=\dfrac{35}{24}\)
a: \(\Leftrightarrow\left(\dfrac{13}{4}:x\right)\cdot\left(-\dfrac{5}{4}\right)=\dfrac{-10}{6}-\dfrac{5}{6}=\dfrac{-15}{6}=\dfrac{-5}{2}\)
\(\Leftrightarrow\dfrac{13}{4}:x=\dfrac{5}{2}\cdot\dfrac{5}{4}=\dfrac{25}{8}\)
hay \(x=\dfrac{13}{4}:\dfrac{25}{8}=\dfrac{13}{4}\cdot\dfrac{8}{25}=\dfrac{26}{25}\)
b: \(\Leftrightarrow\dfrac{3}{4}:x=\dfrac{11}{36}-\dfrac{1}{4}=\dfrac{2}{36}=\dfrac{1}{18}\)
=>\(x=\dfrac{3}{4}:\dfrac{1}{18}=\dfrac{54}{4}=\dfrac{27}{2}\)
c: \(\Leftrightarrow\left(-\dfrac{6}{5}+x\right):\left(-3.6\right)=-\dfrac{7}{4}+\dfrac{1}{4}\cdot8=\dfrac{1}{4}\)
=>x-6/5=-9/10
=>x=3/10
Bài 1:
a) \(2\)\(\dfrac{2}{3}\)\(=\dfrac{8}{3}\)
b) \(1\)\(\dfrac{5}{7}=\dfrac{12}{7}\)
\(\frac{1}{6}:\left(x-\frac{1}{3}\right)-\frac{5}{6}=\frac{5}{9}\times2\frac{8}{6}\)
\(\Leftrightarrow\frac{1}{6}:\left(\frac{3x-1}{3}\right)=\frac{5}{6}+\frac{5}{9}\times2\frac{4}{3}\)
\(\Leftrightarrow\frac{1}{6}\times\frac{3}{3x-1}=\frac{5}{6}+\frac{5}{9}\times\frac{10}{3}\)
\(\Leftrightarrow\frac{1}{2}\times\frac{1}{3x-1}=\frac{45+100}{54}\)
\(\Leftrightarrow\frac{1}{3x-1}=\frac{2\cdot145}{54}=\frac{145}{27}\)
\(\Leftrightarrow3x-1=\frac{27}{145}\Leftrightarrow3x=\frac{27}{145}+1=\frac{172}{145}\)
\(\Leftrightarrow x=\frac{172}{435}\).
\(2\frac{2}{5}\) x \(\frac{25}{18}\) = \(\frac{12}{5}x\frac{25}{18}=\frac{10}{3}\) x = nhân
\(\frac{9}{11}:2\frac{5}{2}x2\frac{3}{4}\) = \(\frac{9}{11}:\frac{9}{2}x\frac{11}{4}=\frac{2}{11}x\frac{11}{4}=\frac{1}{2}\)
\(10:\frac{35}{24}:\frac{36}{7}=\frac{48}{7}:\frac{36}{7}=\frac{4}{3}\)
\(10,77x9,8+5,23x9,8=\left(10,77+5,23\right)x9,8=156,8\)
\(1,26x3,6:0,28-6,2=4,536:0,28-6,2=16,2-6,2=10\)
\(5\dfrac{2}{5}\times10=\dfrac{27}{5}\times10=54\)