= 18

hok  tốt

1 + 9 + 5 + 6 + 7 = 28

  hok tốt

1 + 9 + 5 + 6 + 7 = 28.

2 + 3 = 5

1 + 6 = 7

3+3=5

1+6

t mình đi

=5

=7

hok tốt

=3/5+3/2

=6/10+15/10

=21/10

= 21/10

\(\dfrac{3}{5}+\dfrac{1}{4}:\dfrac{1}{6}=\dfrac{3}{5}+\dfrac{6}{4}=\dfrac{3}{5}+\dfrac{3}{2}=\dfrac{6}{10}+\dfrac{15}{10}=\dfrac{21}{10}\)

đap số 12

tk nhé 

thanks 

lol@@@@@@@@@@@@@@

6+6=12

tivhs mình mình kết bạn

6+6=12

cậu phải tích mình đã

Tính 

a ) 1/2 x 1/4 x 1/6 

= 1/8 x 1/6

= 1/48

b ) 1/2 x 1/4 : 1/6

= 1/8:1/6

3/4

c ) 1/2 : 1/4 x 1/6 

= 2 x 1/6

= 1/3

tk mk nha ( nếu đúng )

hihi mơn nha !!!!!!!!!

a, : 1/2 x 1/4 x 1/6 = 1/8 x 1/6 = 1/48

b, ; 1/2 x 1/4 : 1/6 = 1/8 : 1/6 = 6/8 = 3/4

c, 1/2 : 1/4 x 1/6 = 4/2 x 1/6 = 4/12 = 1/3

\(a,\dfrac{6}{11}+6+\dfrac{5}{7}=\dfrac{42+462+55}{77}=\dfrac{559}{77}\)

\(b,\dfrac{9}{8}\times\dfrac{3}{12}:\dfrac{5}{9}=\dfrac{9}{8}\times\dfrac{3}{12}\times\dfrac{9}{5}=\dfrac{243}{480}=\dfrac{81}{160}\)

\(c,\dfrac{8}{7}:4+2=\dfrac{8}{7}\times\dfrac{1}{4}+2=\dfrac{8}{28}+2=\dfrac{2}{7}+2=\dfrac{16}{7}\)

\(d,\dfrac{3}{5}+4:\dfrac{6}{4}=\dfrac{3}{5}+4\times\dfrac{4}{6}=\dfrac{3}{5}+\dfrac{8}{3}=\dfrac{49}{15}\)

\(a,\dfrac{6}{11}+6+\dfrac{5}{7}=\dfrac{6}{11}+\dfrac{66}{11}+\dfrac{5}{7}=\dfrac{72}{11}+\dfrac{5}{7}=\dfrac{504}{77}+\dfrac{55}{77}=\dfrac{559}{77}\)

\(b,\dfrac{9}{8}\times\dfrac{3}{12}:\dfrac{5}{9}=\dfrac{9}{32}:\dfrac{5}{9}=\dfrac{9}{32}\times\dfrac{9}{5}=\dfrac{81}{160}\)

\(c,\dfrac{8}{7}:4+2=\dfrac{8}{7}\times\dfrac{1}{4}+2=\dfrac{2}{7}+2=\dfrac{2}{7}+\dfrac{14}{7}=\dfrac{16}{7}\)

\(d,\dfrac{3}{5}+4:\dfrac{6}{4}=\dfrac{3}{5}+4\times\dfrac{4}{6}=\dfrac{3}{5}+\dfrac{8}{3}=\dfrac{9}{15}+\dfrac{40}{15}=\dfrac{49}{15}\)

giúp mik với

\(\frac{2-x}{x+3}=\frac{6}{5}\)

<=>\(5\left(2-x\right)=6\left(x+3\right)\)

<=>\(10-5x=6x+18\)

<=>\(\left(-5x\right)-6x=18-10\)

<=>\(-11x=8\)

<=>\(x=\frac{-8}{11}\)

cảm ơn bn

1: \(=\dfrac{3}{8}\cdot\dfrac{5}{6}=\dfrac{15}{24}=\dfrac{5}{8}\)

2: \(=\dfrac{2}{3}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{14+6}{21}=\dfrac{20}{21}\)

3: \(=\dfrac{24}{5}\cdot\dfrac{5}{12}=2\)

4: \(=\dfrac{1}{3}+\dfrac{3}{4}=\dfrac{4+9}{12}=\dfrac{13}{12}\)

`1/2xx3/4:6/5= 1/2 xx 3/4 xx 5/6 = 3/8 xx 5/6 =5/16`           

`2/3+1/6:7/12 = 2/3 + 1/6 xx 12/7 = 2/3 + 2/7 = 14/21 + 6/21 = 20/21`       

`8xx3/5:12/5= 8xx 3/5 xx 5/12 = 24/5 xx 5/12 = 2`         

`4/9+3/4-1/3= (16/36 + 27/36 ) - 1/3 = 43/36 - 1/3 = 31/36`

`1/2xx3/4:6/5`

`=1/2xx3/4xx5/6`

`=3/8xx5/6`

`=15/48`

`=5/16`

__

`2/3+1/6:7/12`

`=2/3+1/6xx12/7`

`=2/3+2/7`

`=14/21+6/21`

`=20/21`

__

`8xx3/5:12/5`

`=8xx3/5xx5/12`

`=8xx1/4`

`=8/4`

`=2`

__

`4/9+3/4-1/3`

`=(4/9-1/3)+3/4`

`=(4/9-3/9)+3/4`

`=1/9+3/4`

`=4/36+27/36`

`=31/36`