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4/7 *1/3+5/7:2/3
\(\frac{4}{21}\)+ \(\frac{15}{14}\)= \(\frac{53}{42}\)
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\(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{2}{5}+\dfrac{3}{5}\right)=1+1=2\)
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`@` `\text {Ans}`
`\downarrow`
`(1/2-1/3+1/4-1/5):(1/4-1/5)`
`=`\(\left(\dfrac{1}{6}+\dfrac{1}{20}\right)\div\dfrac{1}{20}\)
`=`\(\dfrac{1}{20}\div\dfrac{1}{20}+\dfrac{1}{6}\div\dfrac{1}{20}\)
`= 1+10/3`
`= 13/3`
A = (\(\dfrac{1}{2}\) - \(\dfrac{1}{3}\) + \(\dfrac{1}{4}\) - \(\dfrac{1}{5}\)): (\(\dfrac{1}{4}\) - \(\dfrac{1}{5}\))
A = ( \(\dfrac{30}{60}\) - \(\dfrac{20}{60}\) + \(\dfrac{15}{60}\) - \(\dfrac{12}{60}\)):(\(\dfrac{5}{20}\) - \(\dfrac{4}{20}\))
A = \(\dfrac{13}{60}\): \(\dfrac{1}{20}\)
A = \(\dfrac{13}{60}\times\dfrac{20}{1}\)
A = \(\dfrac{13}{3}\)
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a: =1/2(3/4+1)=1/2x7/4=7/8
b: =9/8-1/6=27/24-4/24=23/24
CÓ VẺ LÀ HƠI KHÓ HỈ CẬU Ạ
\(2\times\frac{2}{4}\div\frac{4}{5}\)
\(\Rightarrow\frac{2}{1}\times\frac{2}{4}\div\frac{4}{5}\)
\(\Rightarrow\frac{4}{4}\div\frac{4}{5}\)
\(\Rightarrow\frac{4}{4}\times\frac{5}{4}\)
\(\Rightarrow\frac{5}{4}\)