Bài 2:
a: =>124x=4464
hay x=36
b: =>y=2652:26=102
c: \(\Leftrightarrow x\cdot\dfrac{1}{2}=\dfrac{2}{3}\)
hay \(x=\dfrac{2}{3}:\dfrac{1}{2}=\dfrac{4}{3}\)
d: \(\Leftrightarrow x=\dfrac{5}{2}\cdot\dfrac{4}{5}=2\)
e: \(\Leftrightarrow x\cdot2=\dfrac{22}{5}\)
hay x=11/5
f: \(\Leftrightarrow\dfrac{26}{5}-x=\dfrac{225}{45}=5\)
hay x=1/5
g: \(\Leftrightarrow x:\dfrac{3}{4}=\dfrac{9}{14}-\dfrac{2}{14}=\dfrac{1}{2}\)
hay x=3/8
h: \(\Leftrightarrow x\cdot\dfrac{1}{4}=\dfrac{2}{3}\)
\(\Leftrightarrow x=\dfrac{2}{3}:\dfrac{1}{4}=\dfrac{8}{3}\)
Bài 2:
a) \(124\times x=4829-365\)
\(124\times x=4464\)
\(x=4464:124\)
\(x=36\)
b) \(2652:y=26\)
\(y=2652:26\)
\(y=102\)
c) \(x\times\dfrac{1}{2}=1-\dfrac{1}{3}\)
\(x\times\dfrac{1}{2}=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}:\dfrac{1}{2}\)
\(x=\dfrac{4}{3}\)
d) \(x:\dfrac{4}{5}=\dfrac{5}{2}\)
\(x=\dfrac{5}{2}\times\dfrac{4}{5}\)
\(x=2\)
e) \(x\times\dfrac{2}{3}+x\times\dfrac{4}{3}=\dfrac{22}{5}\)
\(x\times\left(\dfrac{2}{3}+\dfrac{4}{3}\right)=\dfrac{22}{5}\)
\(x\times2=\dfrac{22}{5}\)
\(x=\dfrac{22}{5}:2\)
\(x=\dfrac{11}{5}\)
f) \(\dfrac{26}{5}-x=\dfrac{9}{15}\times\dfrac{25}{3}\)
\(\dfrac{26}{5}-x=5\)
\(x=\dfrac{26}{5}-5\)
\(x=\dfrac{1}{5}\)
g) \(x:\dfrac{3}{4}=\dfrac{9}{14}-\dfrac{1}{7}\)
\(x:\dfrac{3}{4}=\dfrac{1}{2}\)
\(x=\dfrac{3}{4}\times\dfrac{1}{2}\)
\(x=\dfrac{3}{8}\)
h) \(x\times\dfrac{1}{2}-x\times\dfrac{1}{4}=\dfrac{2}{3}\)
\(x\times\left(\dfrac{1}{2}-\dfrac{1}{4}\right)=\dfrac{2}{3}\)
\(x\times\dfrac{1}{4}=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}:\dfrac{1}{4}\)
\(x=\dfrac{8}{3}\)