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c1 {3/4+1/2}*5/7
=5/4*5/7
=25/28
c2 {3/4+1/2}*5/7
= 3/4*5/7+1/2*5/7
=15/28+5/14
=25/28
Cách \(1:\)\(\frac{7}{15}x\frac{4}{9}+\frac{4}{9}x\frac{11}{12}\)
\(=\frac{28}{135}+\frac{11}{27}\)
\(=\frac{28}{135}+\frac{11}{27}\)
\(=\frac{28}{135}+\frac{55}{135}\)
\(=\frac{83}{135}\)
Cách \(2:\)\(\frac{7}{15}x\frac{4}{9}+\frac{4}{9}x\frac{11}{12}\)
\(=\frac{4}{9}x\left(\frac{7}{15}+\frac{11}{12}\right)\)
\(=\frac{4}{9}x\left(\frac{84}{180}+\frac{165}{180}\right)\)
\(=\frac{4}{9}x\frac{83}{60}\)
\(=\frac{83}{165}\)
\(\frac{7}{15}x\frac{4}{9}+\frac{4}{9}x\frac{11}{12}\)
C1 = \(\left(\frac{7}{15}+\frac{11}{12}\right)x\frac{4}{9}\)
= \(\frac{83}{60}x\frac{4}{9}\)
= \(\frac{332}{540}\)
C2 \(\frac{7}{15}x\frac{4}{9}+\frac{4}{9}x\frac{11}{12}\)
= \(\frac{28}{135}+\frac{44}{108}\)
= \(\frac{332}{540}\)
\(\frac{3}{22}\times\frac{3}{11}\times22\)
1.\(=\frac{3\times3\times22}{22\times11\times1}\)
\(=\frac{3\times3}{11\times1}\)
\(=\frac{9}{11}\)
2. \(=\frac{9}{242}\times22\)
\(=\frac{198}{242}\)
\(=\frac{9\times2\times11}{2\times11\times11}\)
\(=\frac{9}{11}\)
\(\left(\frac{1}{2}+\frac{1}{3}\right)\times\frac{2}{5}\)
1.\(=\frac{5}{6}\times\frac{2}{5}\)
\(=\frac{5\times2}{3\times2\times5}\)
\(=\frac{1}{3}\)
2.\(\)\(=\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}\)
\(=\frac{1}{5}+\frac{2}{15}\)
\(=\frac{3}{15}+\frac{2}{15}\)
\(=\frac{5}{15}=\frac{1}{3}\)
Have a good day
\((\frac{3}{5}+\frac{2}{5})+(\frac{4}{7}+\frac{1}{7}+\frac{2}{7})\) ) =1+1=2
\(\frac{3}{5}\times\frac{7}{21}+\frac{7}{21}\times\frac{2}{5}=\frac{7}{21}\times\left(\frac{3}{5}+\frac{2}{5}\right)=\frac{1}{3}\times\left(\frac{3}{5}+\frac{2}{5}\right)=\frac{1}{3}\times1=\frac{1}{3}\)
Học tốt !
\(\frac{3}{5}\cdot\frac{7}{21}+\frac{7}{21}+\frac{2}{5}\)
\(=\frac{7}{21}\cdot(\frac{3}{5}+\frac{2}{5})\)
\(=\frac{7}{21}\cdot1=\frac{7}{21}=\frac{1}{3}\)