\(\frac{5}{12}-\frac{7}{32}:\frac{21}{16}=\frac{5}{12}-\frac{7}{32}\times\frac{16}{21}=\frac{5}{12}-\frac{112}{672}=\frac{5}{12}-\frac{2}{12}=\frac{3}{12}=\frac{1}{4}\)

\(\frac{5}{12}-\frac{7}{32}:\frac{21}{16}\)

= \(\frac{5}{12}-\frac{1}{6}\)

= \(\frac{1}{4}\)

46/35 nha bn. mk quen nhau rùi mà

Bằng 46/35

KB  và cho mk 1 L-I-K-E nha !!!

1/5*2/7:1/7=1/5*2/7*7.

               =(1*2*7)/(5*7*1).

               =2/5.

tk mk nha các bn.

-chúc ai tk mk học giỏi nha-

\(\frac{1}{5}.\frac{2}{7}.7=\frac{2}{5}\)

\(\frac{7}{9}.\frac{3}{4}:\frac{5}{8}=\frac{7}{12}:\frac{5}{8}=\frac{7}{12}.\frac{8}{5}=\frac{14}{15}\)

14/15

\(x=\frac{1}{2}+\frac{3}{4}=\frac{2}{4}+\frac{3}{4}=\frac{5}{4}\)

\(x-\frac{3}{4}=\frac{1}{2}\)

\(x=\frac{1}{2}+\frac{3}{4}\)

\(x=\frac{2}{4}+\frac{3}{4}\)

\(x=\frac{5}{4}\)

\(\frac{3}{8}+\frac{4}{5}=\frac{15}{40}+\frac{32}{40}=\frac{47}{40}\)

47/40 bn nhé

kbn nha

\(a.\left(\frac{6}{11}+\frac{5}{11}\right).\frac{3}{7}=1\cdot\frac{3}{7}=\frac{3}{7}b.\frac{3}{5}\cdot\frac{7}{9}+\frac{3}{5}\cdot\frac{2}{9}=\frac{3}{5}\cdot\left(\frac{7}{9}+\frac{2}{9}\right)=\frac{3}{5}\cdot1=\frac{3}{5}\)

bằng \(\frac{23}{12}\)

đồng ý