\(\frac{5}{8}\times\frac{9}{7}+\frac{5}{8}\times\frac{5}{7}\)

\(=\frac{5}{8}\times\left(\frac{9}{7}+\frac{5}{7}\right)\)

\(=\frac{5}{8}\times\frac{14}{7}\)

\(=\frac{5}{8}\times2\)

\(=\frac{10}{8}\)

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

Giải :

\(\frac{9}{11}:\left(\frac{6}{7}-\frac{5}{6}\right)\)

\(=\frac{9}{11}:\frac{1}{42}\)

\(=\frac{378}{11}\)

Mọi người giải giúp mình bài tìm x với

\(x=\dfrac{4}{7}:\dfrac{3}{5}=\dfrac{4\times5}{7\times3}=\dfrac{20}{21}\)

=>x=4/7:3/5

x=4/7 x 5/3

x=20/21

1) 1/3 x 1/2 x 3/7 = 3/42 = 1/14

2) 5/4 x 1/3 +1/7 = 5/12 + 1/7 = 35/84 + 12/84 = 47/84

3) 8 x ( 8/9 - 2/3 ) = 8 x 2/9 = 16/9

4) 5/6 x 48/20 x 1/2 = 240/240 = 1

5) ( 2/5 + 3/4 ) + 8 = 23/20 + 8 = 23//20 + 160/20 = 183/20

6) 10 x ( 1/2 - 1/5 ) = 10 x 3/10 = 10/1 x 3/10 = 30/10 = 3

`5/3 xx 7/4 + 5/3 xx 5/4`

`=5/3 xx (7/4 + 5/4)`

`=5/3 xx 12/4

`=5/3 xx 3`

`=5`

( 7/4+5/4) x 5/3= 12/4 x 5/3 = 3 x 5/3= 5

1200-31/40=47969/40

câu 2 =45/56+25/56=(45+25)/56=70/56=5/4

\(\frac{5}{2}\)x\(\frac{1}{3}\)+\(\frac{1}{4}\)= \(\frac{5}{6}\)+\(\frac{1}{4}\)= \(\frac{10}{12}\)+\(\frac{3}{12}\)= \(\frac{13}{12}\)

\(\frac{5}{2}\)-\(\frac{1}{3}\):\(\frac{1}{4}\)= \(\frac{5}{2}\)-\(\frac{1}{3}\)x\(\frac{4}{1}\)= \(\frac{5}{2}\)-\(\frac{4}{3}\)= \(\frac{15}{6}\)-\(\frac{8}{6}\)=\(\frac{7}{6}\)

Chi tiết lun nha, nhớ k đúng cho mik nha :33

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

\(=\frac{5}{6}+\frac{1}{4}\)

\(=\frac{10}{12}+\frac{3}{12}\)

\(=\frac{13}{12}\)

\(\frac{5}{2}-\frac{1}{3}\div\frac{1}{4}\)

\(=\frac{5}{2}-\frac{1}{3}\times\frac{4}{1}\)

\(=\frac{5}{2}-\frac{4}{3}\)

\(=\frac{15}{6}-\frac{8}{6}\)

\(=\frac{7}{6}\)