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\(\dfrac{7}{12}=\dfrac{3}{12}+\dfrac{4}{12}=\dfrac{1}{4}+\dfrac{1}{3}\)
\(\dfrac{13}{27}=\dfrac{9}{27}+\dfrac{4}{27}=\dfrac{1}{3}+\dfrac{4}{27}\)
\(\dfrac{7}{12}\) = \(\dfrac{1+6}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{6}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{1}{2}\)
\(\dfrac{7}{12}\) = \(\dfrac{3+4}{12}\) = \(\dfrac{3}{12}\) + \(\dfrac{4}{12}\) = \(\dfrac{1}{4}\) + \(\dfrac{1}{3}\)
\(\dfrac{13}{27}\) = \(\dfrac{1+12}{27}\) = \(\dfrac{1}{27}\) + \(\dfrac{12}{27}\) = \(\dfrac{1}{27}\) + \(\dfrac{4}{9}\)
\(\dfrac{13}{27}\) = \(\dfrac{4+9}{27}\) = \(\dfrac{4}{27}\) + \(\dfrac{9}{27}\) = \(\dfrac{4}{27}\) + \(\dfrac{1}{3}\)
\(\dfrac{13}{27}\) = \(\dfrac{6+7}{27}\) = \(\dfrac{6}{27}\) + \(\dfrac{7}{27}\) = \(\dfrac{2}{9}\) + \(\dfrac{7}{27}\)
Ta có:\(\frac{7}{16}=\frac{3}{16}+\frac{4}{16}=\frac{3}{16}+\frac{1}{4}\)
Vậy Phân số \(\frac{7}{16}\)= \(\frac{3}{16}+\frac{1}{4}\)
\(\frac{9}{10}=\frac{3}{5}+\frac{3}{10}\)
HT
`7/12 = 6/12 + 1/12 = 1/2 + 1/12`
`7/12 = 3/12 + 4/12 = 1/4+1/3`
`7/12 =2/12 + 5/12 = 1/6 + 5/12`
1/4=3/12=1/12+2/12=1/12+1/6
câu 2: 8/21=(2*4)/(3*7)=2/3*4/7
câu 3:tìm ra được 2 phân số đó là 2/5 và 3/7 hoặc 2/7 và 3/5 rồi cộng vào
10/27 = 2/9 + 4/27
\(\dfrac{10}{27}\) = \(\dfrac{3+7}{27}\) = \(\dfrac{3}{27}\) + \(\dfrac{7}{27}\) = \(\dfrac{1}{9}\) + \(\dfrac{7}{27}\)
\(\dfrac{10}{27}\) = \(\dfrac{1}{9}\) + \(\dfrac{7}{27}\)
\(\dfrac{10}{27}\) = \(\dfrac{6+4}{27}\) = \(\dfrac{6}{27}\) + \(\dfrac{4}{27}\) = \(\dfrac{2}{9}\) + \(\dfrac{4}{27}\)
\(\dfrac{10}{27}\) = \(\dfrac{9+1}{27}\) = \(\dfrac{9}{27}\) + \(\dfrac{1}{27}\) = \(\dfrac{1}{3}\) + \(\dfrac{1}{27}\)
\(\dfrac{10}{27}\) = \(\dfrac{1}{3}\) + \(\dfrac{1}{27}\)