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a) \(\dfrac{3}{4}-\dfrac{1}{8}=\dfrac{6}{8}-\dfrac{1}{8}=\dfrac{6-1}{8}=\dfrac{5}{8}\)
b) \(\dfrac{2}{6}-\dfrac{5}{18}=\dfrac{6}{18}-\dfrac{5}{18}=\dfrac{6-5}{18}=\dfrac{1}{18}\)
c) \(\dfrac{2}{5}-\dfrac{3}{20}=\dfrac{8}{20}-\dfrac{3}{20}=\dfrac{8-3}{20}=\dfrac{5}{20}=\dfrac{1}{4}\)
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\(\frac{5}{12}+\frac{5}{6}-\frac{3}{4}\)
\(=\frac{5}{12}+\frac{10}{12}-\frac{9}{12}\)
\(=\frac{5+10-9}{12}\)
\(=\frac{6}{12}\)
\(=\frac{1}{2}\)
\(\frac{3}{5}+\frac{6}{4}+\frac{5}{2}\)
\(=\frac{24}{40}+\frac{60}{40}+\frac{100}{40}\)
\(=\frac{24+60+100}{40}\)
\(=\frac{184}{40}\)
Tự rứt gọn nha !
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`4/7 + 3/4 + 2/7 = (4/7 + 2/7 ) +3/4 = 6/7 + 3/4 = 24/28 + 21/28 =45/28`
`18/7 - 2= 18/7 - 2/1 = 18/7 - 4/7 `
`10/12 - 12/36=30/36 - 12/36=18/36=1/2`
`5/3 - 3/5 + 6/11=(25/15-9/15) + 6/11 =16/15 + 6/11 = (506+90)/165=596/165`
`3/5 xx 3/7 : 5 = 3/5 xx3/7 xx 1/5 = 9/35 xx 1/5 = 9/175`
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\(\dfrac{5}{3}-\dfrac{5}{12}=\dfrac{5\cdot4-5}{12}=\dfrac{20-5}{12}=\dfrac{15}{12}=\dfrac{5}{4}\)