x×5+x÷0,2=100÷1/4
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Bài 1 :
\(\frac{x}{3}-\frac{4}{5}=0,2\)
\(\frac{x}{3}-\frac{4}{5}=\frac{1}{5}\)
\(\frac{x}{3}=\frac{1}{5}+\frac{4}{5}\)
\(\frac{x}{3}=1\)
\(\Rightarrow x=3\)
Bài 2 :
\(\left(\frac{2}{5}-\frac{1}{3}\right)-x=\frac{5}{6}\)
\(\frac{1}{15}-x=\frac{5}{6}\)
\(x=\frac{1}{15}-\frac{5}{6}\)
\(x=\frac{-23}{30}\)
1: =>x=3/5-1/5=2/5
b: =>x/3=5/8+1/8=3/4
=>x=9/4
3: =>10/3x=3+1/4+6+3/4=10
=>x=10:10/3=3
\(\dfrac{3}{2}x-0,2=\dfrac{3}{5}\)
\(\dfrac{3}{2}x-\dfrac{1}{5}=\dfrac{3}{5}\)
\(\dfrac{3}{2}x=\dfrac{3}{5}+\dfrac{1}{5}\)
\(\dfrac{3}{2}x=\dfrac{4}{5}\)
\(x=\dfrac{4}{5}:\dfrac{3}{2}\)
\(x=\dfrac{4}{5}\cdot\dfrac{2}{3}\)
\(x=\dfrac{8}{15}\)
\(\dfrac{1}{3}+x=\dfrac{3}{4}\)
\(x=\dfrac{3}{4}-\dfrac{1}{3}\)
\(x=\dfrac{9}{12}-\dfrac{4}{12}\)
\(x=\dfrac{5}{12}\)
\(1\dfrac{1}{2}x-\dfrac{2}{5}=\dfrac{1}{4}\)
\(\dfrac{3}{2}x-\dfrac{2}{5}=\dfrac{1}{4}\)
\(\dfrac{3}{2}x=\dfrac{1}{4}+\dfrac{2}{5}\)
\(\dfrac{3}{2}x=\dfrac{13}{20}\)
\(x=\dfrac{13}{20}:\dfrac{3}{2}\)
\(x=\dfrac{13}{20}\cdot\dfrac{2}{3}\)
\(x=\dfrac{13}{30}\)
\(\dfrac{11}{8}-\dfrac{3}{8}\cdot x=\dfrac{1}{8}\)
\(\dfrac{3}{8}\cdot x=\dfrac{11}{8}-\dfrac{1}{8}\)
\(\dfrac{3}{8}\cdot x=\dfrac{5}{4}\)
\(x=\dfrac{5}{4}:\dfrac{3}{8}\)
\(x=\dfrac{5}{4}\cdot\dfrac{8}{3}\)
\(x=\dfrac{10}{3}\)
a : 0,01 = a x 100
a : 100 = a x 0,01
a : 0,5 = a x 2
a : 0,2 = a x 5
a, \(\frac{1}{5}+x=\frac{7}{10}\)
\(x=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)
b, \(\left(\frac{1}{3}-\frac{1}{4}\right):x+25\%=0,2\)
\(\Leftrightarrow\frac{\frac{1}{3}-\frac{1}{4}}{x}+0,25=0,2\)
\(\Leftrightarrow\frac{\frac{1}{12}}{x}=-0,05\)
\(\Leftrightarrow\frac{1}{12}=-0,05x\)
\(\Leftrightarrow x\approx1,7\)
x=7/10-1/5
x=7/10-2/10
x=1/2
(1/3-1/4):x+1/4=1/5
1/12:x+1/4=1/5
1/12:x=1/5+1/4
1/12:x=9/20
x=1/12:9/20
x=1/12×20/9
x=27/5