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a) \(\dfrac{36}{42}\) = \(\dfrac{18}{21}\) = \(\dfrac{6}{7}\) = \(\dfrac{30}{35}\)
b) \(\dfrac{80}{100}\) =\(\dfrac{16}{20}\) = \(\dfrac{4}{5}\) = \(\dfrac{40}{50}\)
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a, \(=\dfrac{1+4}{5}+\dfrac{5+1+3}{9}=1+1=2\)
b, \(=\dfrac{1+4+2}{3}+\dfrac{1+2+5}{6}=\dfrac{6}{3}+\dfrac{8}{6}=2+\dfrac{4}{3}=\dfrac{6+4}{3}=\dfrac{10}{3}\)
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\(\dfrac{5}{6}=\dfrac{10}{12}=\dfrac{30}{36}\)
\(\dfrac{9}{12}=\dfrac{6}{8}=\dfrac{15}{20}\)
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`5/9xx1/4+4/9xx3/12`
`=5/9xx1/4+4/9xx1/4`
`=1/4xx(5/9+4/9)`
`=1/4xx9/9`
`=1/4xx1`
`=1/4`
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a: =20/90+15/90+54/90=89/90
b: =(9/13+4/13)+2/3=1+2/3=5/3
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\(a,\dfrac{7}{12}+\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{7}{12}+\dfrac{1}{6}=\dfrac{7}{12}+\dfrac{2}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)
\(b,\dfrac{8}{9}-\dfrac{4}{15}:\dfrac{2}{5}=\dfrac{8}{9}-\dfrac{4}{15}\times\dfrac{5}{2}=\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{8}{9}-\dfrac{6}{9}=\dfrac{2}{9}\)
36/50 + 9/5 + 4/50
=36/50 + 90/50 + 4/50
=(36/50 + 4/50) + 90/50
=40/50 + 90/50
=130/50
=13/5
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