\(\dfrac{3}{22}\times\dfrac{3}{11}\times22=\dfrac{6}{11}\)

2 cách mà bn ? 

a) Cách 1 : (3/4 + 1/2) x 5/7

               = 5/4 x 5/7

                = 25/28

Cách 2 : (3/4 + 1/2) x 5/7

           = 3/4 x 5/7 + 1/2 x 5/7

            = 15/28 + 5/14

            = 25/28

b) Cách 1 : 5/7 x 13/21 + 2/7 x 13/21

= 65/147 + 26/147

= 13/21

Cách 2 : 5/7 x 13/21 + 2/7 x 13/21

= (5/7 + 2/7) x 13/21

= 1 x 13/21

= 13/21

câu c tự làm

8 /15 :2/3+7/15:2/3 =                                              tính bằng 2 cách nhé các bạn

a: Cách 1: \(2\frac49+1\frac16\)

\(=\frac{22}{9}+\frac76\)

\(=\frac{44}{18}+\frac{21}{18}=\frac{44+21}{18}=\frac{65}{18}\)

Cách 2: \(2\frac49+1\frac16\)

\(=2+\frac49+1+\frac16\)

\(=\left(2+1\right)+\left(\frac49+\frac16\right)=3+\left(\frac{8}{18}+\frac{3}{18}\right)\)

\(=3+\frac{11}{18}=\frac{3\cdot18+11}{18}=\frac{65}{18}\)

b: Cách 1: \(7\frac18-5\frac24\)

\(=\frac{57}{8}-5\frac12\)

\(=\frac{57}{8}-\frac{11}{2}\)

\(=\frac{57}{8}-\frac{44}{8}=\frac{13}{8}\)

Cách 2:

\(7\frac18-5\frac24\)

\(=7+\frac18-5-\frac24\)

\(=2+\frac18-\frac12\)

\(=2-\frac38=\frac{16}{8}-\frac38=\frac{13}{8}\)

Cách 1: \(\frac23:\frac12:\frac14\)

\(=\frac23\times2\times4\)

\(=\frac{2\times2\times4}{3}=\frac{16}{3}\)

Cách 2:

\(\frac23:\frac12:\frac14\)

\(=\frac23:\left(\frac12\times\frac14\right)\)

\(=\frac23:\frac18=\frac23\times8=\frac{16}{3}\)

a: =3/4*3/2+1/4*2

=3/8+1/2

=3/8+4/8=7/8

b: =4,1:0,15=82/3

Cách 1:

(1/4 + 2/3) x 4/5

= (3/12 + 8/12) x 4/5

= 11/12 x 4/5

= 44/60

= 11/15

Cách 2:

(1/4 + 2/3) x 4/5

= 1/4 x 4/5 + 2/3 x 4/5

= 4/20 + 8/15

=1/5 + 8/15

= 3/15 + 8/15

= 11/15

\(C1:2\dfrac{4}{9}+1\dfrac{1}{6}=\dfrac{22}{9}+\dfrac{7}{6}=\dfrac{44}{18}+\dfrac{21}{18}=\dfrac{65}{18}\)

\(C2:2\dfrac{4}{9}+1\dfrac{1}{6}=\left(2+1\right)+\left(\dfrac{4}{9}+\dfrac{1}{6}\right)=3+\dfrac{11}{18}=\dfrac{54}{18}+\dfrac{11}{18}=\dfrac{65}{18}\)

\(2\dfrac{4}{9}+1\dfrac{1}{6}=\dfrac{22}{9}+\dfrac{7}{6}=\dfrac{44}{18}+\dfrac{21}{18}=\dfrac{65}{18}\)

`(1/4+1/6)xx1/2`

`=(3/12+2/12)xx1/2`

`=5/12xx1/2`

`=5/24`

`(1/4+1/6)xx1/2`

`=1/4xx1/2+1/6xx1/2`

`=1/8+1/12`

`=3/24+2/24`

`=5/24`

nếu ko nhìn thấy dc thì ở đây nhé

\(a,\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\times\dfrac{1}{4}=\dfrac{8}{15}\times\dfrac{1}{4}=\dfrac{8}{60}=\dfrac{2}{15}\)

\(\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\times\dfrac{1}{4}=\dfrac{1}{3}\times\dfrac{1}{4}+\dfrac{1}{5}\times\dfrac{1}{4}=\dfrac{1}{12}+\dfrac{1}{20}=\dfrac{20}{240}+\dfrac{12}{240}=\dfrac{32}{240}=\dfrac{2}{15}\)

\(b,\dfrac{2}{5}\times\dfrac{3}{7}+\dfrac{2}{5}\times\dfrac{4}{7}=\dfrac{2}{5}\times\left(\dfrac{3}{7}+\dfrac{4}{7}\right)=\dfrac{2}{5}\times1=\dfrac{2}{5}\)

\(\dfrac{2}{5}\times\dfrac{3}{7}+\dfrac{2}{5}\times\dfrac{4}{7}=\dfrac{6}{35}+\dfrac{8}{35}=\dfrac{14}{35}=\dfrac{2}{5}\)

trả lời nhanh nha! trả lời trong tối hôm nay 19/3/2023 ạ