ko hiểu

\(=\dfrac{5}{9}\times\dfrac{7}{4}+\dfrac{13}{9}\times\dfrac{7}{4}\\ =\left(\dfrac{5}{9}+\dfrac{13}{9}\right)\times\dfrac{7}{4}\\ =2\times\dfrac{7}{4}\\ =\dfrac{7}{2}\)

`5/9 : 4/7 + 13/9 xx 7/4`

`= 5/9 xx 7/4 + 13/9 xx 7/4`

`= ( 5/9 + 13/9 ) xx 7/4`

`= 18/9 xx 7/4`

`= 2 xx 7/4`

`=7/2` 

\(=\dfrac{5}{9}\times\dfrac{7}{4}+\dfrac{13}{9}\times\dfrac{7}{4}=\dfrac{7}{4}\times\left(\dfrac{5}{9}+\dfrac{13}{9}\right)=\dfrac{7}{4}\times2=\dfrac{14}{4}=\dfrac{7}{2}\)

a, 2/5 + 1/6 + 3/5

= ( 2/5 + 3/5 ) + 1/6

=        5/5 + 1/6

=          1 + 1/6

=         6/6 + 1/6 

=            7/6

b, 9/13 + 4/13 + 2/3

=        13/13    + 2/3

=            1 + 2/3

= 3/3 + 2/3

=             5/3

2/5+1/6+3/5

=(2/5+3/5)+1/6

=5/5+1/6

=1+1/6

=7/6

9/13+4/13+2/3

=(9/13+4/13)+2/3

=13/13+2/3

=1+2/3

=5/3

k mk nha các bạn, nhớ kb mk đó

2/5+1/6+3/5=(2/5+3/5)+1/6

                   =1+1/6=7/6

9/13+4/13+2/3

=(9/13+4/13)+2/3

=1+2/3=5/3

AI lấy đêf kiểm tra toán giữa kì 1 không

ai nhanh thì mình sẽ cho

cho mình 

\(\frac{8}{13}\times\frac{3}{7}+\frac{5}{13}\times\frac{9}{21}=\frac{8}{13}\times\frac{3}{7}+\frac{5}{13}\times\frac{3}{7}\)

\(\Rightarrow\left(\frac{8}{13}+\frac{5}{13}\right)\times\frac{3}{7}=1\times\frac{3}{7}\)

\(=\frac{3}{7}\)

k tớ đi

a: =20/90+15/90+54/90=89/90

b: =(9/13+4/13)+2/3=1+2/3=5/3

`a) 5 / 13 xx 4 / 15 xx 13 = [ 5 xx 4 xx 13 ] / [ 13 xx 5 xx 3 ] = 4 / 3`

`b) ( 3 / 7 + 5 / 2 ) xx 7 / 5 = 3 / 7 xx 7 / 5 + 5 / 2 xx 7 / 5 = 3 / 5 + 7 / 2 = 6 / 10 + 35 / 10 = 41 / 10`

`c) 1 / 5 xx 11 / 18 + 11 / 18 xx 3 / 5 = 11 / 18 xx ( 1 / 5 + 3 / 5 ) = 11 / 18 xx 4 / 5 = [ 11 xx 2 xx 2 ] / [ 2 xx 9 xx 5 ] = 22 / 45`

\(a,\dfrac{5}{13}\times\dfrac{4}{15}\times13=\dfrac{4}{3}\)

\(b,\left(\dfrac{3}{7}+\dfrac{5}{2}\right)\times\dfrac{7}{5}=\left(\dfrac{6}{14}+\dfrac{35}{14}\right)\times\dfrac{7}{5}=\dfrac{41}{14}\times\dfrac{7}{15}=\dfrac{41}{30}\)

\(c,\dfrac{1}{5}\times\dfrac{11}{18}+\dfrac{11}{18}\times\dfrac{3}{5}=\dfrac{11}{18}\times\left(\dfrac{1}{5}+\dfrac{3}{5}\right)=\dfrac{11}{18}\times\dfrac{4}{5}=\dfrac{22}{45}\)