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a)
`7/12+3/4xx2/9`
`=7/12+1/6`
`=7/12+2/12`
`=9/12`
`=3/4`
b)
`8/9-4/15:2/5`
`=8/9-4/15xx5/2`
`=8/9-2/3`
`=8/9-6/9`
`=2/9`
\(\dfrac{7}{16}+\dfrac{5}{8}x\dfrac{4}{10}=\dfrac{7}{16}+\dfrac{1}{4}=\dfrac{11}{16}\)
A)
\(\frac{7}{12}+\frac{3}{4}\times\frac{2}{4}\)
\(=\frac{7}{12}\times\left(\frac{3}{4}+\frac{2}{4}\right)\)
\(=\frac{35}{48}\)
B)
\(\frac{8}{9}-\frac{4}{15}:\frac{2}{5}\)
\(=\frac{8}{9}-\frac{2}{3}\)
\(=\frac{6}{27}\)
\(\dfrac{5}{8}+\dfrac{4}{9}=\dfrac{45}{72}+\dfrac{32}{72}=\dfrac{77}{72}\)
\(\dfrac{9}{5}\times\dfrac{20}{27}=\dfrac{180}{135}\)
Tử nhân tử, mẫu nhân mẫu
\(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{2}{5}+\dfrac{3}{5}\right)=1+1=2\)
\(=\dfrac{1}{3}+\dfrac{1}{15}=\dfrac{5}{15}+\dfrac{1}{15}=\dfrac{6}{15}\)
\(x=\dfrac{4}{7}:\dfrac{3}{5}=\dfrac{4\times5}{7\times3}=\dfrac{20}{21}\)
10/15 - 2/5 = 10/15 - 6/15 = 4/15
10/15-2/5=10/15-6/15=4/15