= 3/2 x (4/7 + 3/7)

= 3/2 x   1

= 3/2

3/2 x ( 4/7 + 3/7 )

= 3/2 x 1

= 3/2

\(\dfrac{3}{2}\times\dfrac{4}{7}+\dfrac{3}{7}\times\dfrac{3}{2}\\ =\dfrac{3}{7}\times\dfrac{4}{2}+\dfrac{3}{7}\times\dfrac{3}{2}\\ =\dfrac{3}{7}\times\left(\dfrac{4}{2}+\dfrac{3}{2}\right)\\ =\dfrac{3}{7}\times\dfrac{7}{2}\\ =\dfrac{3}{2}\)

\(\dfrac{3}{5}+\dfrac{6}{11}+\dfrac{7}{13}+\dfrac{2}{5}+\dfrac{16}{11}+\dfrac{19}{13}\\ =\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{6}{11}+\dfrac{16}{11}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)\\ =\dfrac{5}{5}+\dfrac{22}{11}+\dfrac{26}{13}\\ =1+2+2\\ =5\)

5

giải chi tiết hộ mình nhé

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)

\(=\dfrac{7}{10}\times\left(3+5+2\right)\)

\(=\dfrac{7}{10}\times10\)

\(=\dfrac{70}{10}=7\)

giúp mình đi T.T

7

^{_{\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)}}

^{_{\(=\dfrac{7}{10}\times\left(3+5+2\right)\)}}

^{_{\(=\dfrac{7}{10}\times10\)}}

^_\(=7\)

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}=\dfrac{7}{10}\left(3+5+2\right)=\dfrac{7}{10}\times10=7\)

`3+1/9+3/9+2+5/9+3+2`

`= ( 3 +2+3+2) +(1/9+ 3/9 + 5/9)`

`= 10 + 9/9`

`=10 + 1`

`=11`

\(3+\dfrac{1}{9}+\dfrac{3}{9}+2+\dfrac{5}{9}+3+2\)

\(=3+\left(\dfrac{1}{9}+\dfrac{3}{9}+\dfrac{5}{9}\right)+2+3+2\)

\(=\left(3+2+3+2\right)+\dfrac{9}{9}\)

\(=10+1=11\)

18 phần11 nhân4 phần5 trừ7 phần11 nhân4 phần5 cộng9 phần3 nhân2 phần5

`[` Tham Khảo `]`

`35 xx 5 - 35 xx 2 + 35 xx7`

`= 35 xx (5-2+7)`

`= 35 xx 10`

`=350`

= 35 × (5 + 7 - 2)

= 35 × 10

= 350

=35×(5-2+7)

=35×10

=350

9,3 x 6,7 + 9,3  x 3,3 = 9,3 x ( 6,7 + 3,3 )

                                   = 9,3 x 10 

                                    = 93

7,8 x 0,35 + 0,35 x 2,2 = 0,35 x ( 7,8 + 2,2 )

                                     = 0,35 x 10 

                                     = 3,5

Đáp án là: 

a) 9,3 x 6,7 + 9,3 x 3,3 

= 9,3 x (6,7+3,3) 

= 9,3 x 10 

= 93. 

b) 7,8 x 0,35 + 0,35 x 2,2 

= 0,35 x (7,8+2,2) 

= 0,35 x 10 

= 35

_9,3x6,7+9,3x3,3

=9,3x(6,7+3,3)

=9,3x10

=93

_7,8x0,35+0,35x2,2

=0,35x(7,8+2,2)

=0,35x10

=3,5

Bài 1:
\(\dfrac{36}{21}-\dfrac{15}{20}\)
\(=\dfrac{12}{7}-\dfrac{3}{4}\)
\(=\dfrac{48}{28}-\dfrac{21}{28}\)
\(=\dfrac{27}{28}\)
\(----\)
\(\dfrac{63}{45}-\dfrac{20}{25}\)
\(=\dfrac{63}{45}-\dfrac{4}{5}\)
\(=\dfrac{63}{45}-\dfrac{36}{45}\)
\(=\dfrac{27}{45}=\dfrac{3}{5}\)
Bài 2:
\(\dfrac{3}{5}+\dfrac{3}{16}+\dfrac{13}{16}\)
\(=\dfrac{3}{5}+\left(\dfrac{3}{16}+\dfrac{13}{16}\right)\)
\(=\dfrac{3}{5}+1\)
\(=\dfrac{3}{5}+\dfrac{5}{5}\)
\(=\dfrac{8}{5}\)

`36/21-15/20`

`=12/7-3/4`

`=48/28-21/28`

`=27/28`

__

`63/45-20/25`

`=7/5-4/5`

`=3/5`

__

`2)`

`3/5+3/16+13/16`

`=3/5+(3/16+13/16)`

`=3/5+16/16`

`=3/5+1`

`=3/5+5/5`

`=8/5`

`#QiN`

\(5\dfrac{3}{4}:3+2\dfrac{1}{4}\times\dfrac{1}{3}-\dfrac{1}{8}=\left(5\dfrac{3}{4}+2\dfrac{1}{4}\right)\times\dfrac{1}{3}-\dfrac{1}{8}\\ =8\times\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{8}{3}-\dfrac{1}{8}=\dfrac{61}{24}\\ ----\\ \dfrac{3}{5}:\dfrac{5}{6}:\dfrac{6}{7}:\dfrac{7}{8}+\dfrac{2}{5}+\dfrac{23}{35}\\ =\dfrac{3}{5}\times\dfrac{6}{5}\times\dfrac{7}{6}\times\dfrac{8}{7}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{18}{25}\times\dfrac{4}{3}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{353}{175}\)