a) x + 3/10 = 17/30
x = 17/30 - 3/10
x = 4/15
vậy x =...
`a)x+3/10=17/12-17/20`
`x+3/10=17/30`
`x=17/30-3/10`
`x=8/30=4/15`
`b)x/20=7/12+11/30`
`x/20=19/20`
`<=>20x=20.19`
`<=>20x=380`
`<=>x=19 `
`@Shả`
a) \(x+\dfrac{3}{10}=\dfrac{17}{12}-\dfrac{17}{20}\)
\(x+\dfrac{3}{10}=\dfrac{17}{30}\)
\(x=\dfrac{17}{30}-\dfrac{3}{10}\)
\(x=\dfrac{17}{30}-\dfrac{9}{30}\)
\(x=\dfrac{8}{30}\)
\(x=\dfrac{4}{15}\)
b) \(\dfrac{x}{20}=\dfrac{7}{12}+\dfrac{11}{30}\)
\(\dfrac{x}{20}=\dfrac{19}{20}\)
\(x=\dfrac{19\cdot20}{20}\)
\(x=19\)
c) \(\dfrac{7}{x}< \dfrac{x}{4}< \dfrac{10}{x}\)
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