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\(\frac{9}{10}=\frac{3}{5}+\frac{3}{10}\)
HT
\(\frac{1}{2}=\frac{3}{6}=\frac{1}{6}+\frac{2}{6}=\frac{1}{6}+\frac{1}{3}\)
\(\frac{1}{2}=\frac{6}{12}=\frac{2}{12}+\frac{4}{12}=\frac{1}{6}+\frac{1}{3}\)
Bài 1: \(\frac{7}{6}-\frac{15}{9}=\frac{7}{6}-\frac{5}{3}=\frac{7}{6}-\frac{10}{6}=-\frac{3}{6}=-\frac{1}{2}\)
Bài 2:\(\frac{1}{2}=\frac{1}{3}+\frac{1}{6}\)
Ta có:\(\frac{7}{16}=\frac{3}{16}+\frac{4}{16}=\frac{3}{16}+\frac{1}{4}\)
Vậy Phân số \(\frac{7}{16}\)= \(\frac{3}{16}+\frac{1}{4}\)
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
\(\dfrac{7}{12}=\dfrac{3}{12}+\dfrac{4}{12}=\dfrac{1}{4}+\dfrac{1}{3}\)
\(\dfrac{13}{27}=\dfrac{9}{27}+\dfrac{4}{27}=\dfrac{1}{3}+\dfrac{4}{27}\)
\(\dfrac{7}{12}\) = \(\dfrac{1+6}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{6}{12}\) = \(\dfrac{1}{12}\) + \(\dfrac{1}{2}\)
\(\dfrac{7}{12}\) = \(\dfrac{3+4}{12}\) = \(\dfrac{3}{12}\) + \(\dfrac{4}{12}\) = \(\dfrac{1}{4}\) + \(\dfrac{1}{3}\)
\(\dfrac{13}{27}\) = \(\dfrac{1+12}{27}\) = \(\dfrac{1}{27}\) + \(\dfrac{12}{27}\) = \(\dfrac{1}{27}\) + \(\dfrac{4}{9}\)
\(\dfrac{13}{27}\) = \(\dfrac{4+9}{27}\) = \(\dfrac{4}{27}\) + \(\dfrac{9}{27}\) = \(\dfrac{4}{27}\) + \(\dfrac{1}{3}\)
\(\dfrac{13}{27}\) = \(\dfrac{6+7}{27}\) = \(\dfrac{6}{27}\) + \(\dfrac{7}{27}\) = \(\dfrac{2}{9}\) + \(\dfrac{7}{27}\)
1/2=1/3+1/6=1/8+3/8 k mk nha