1.\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{8\times3}{33\times4}=\dfrac{8\times12}{11\times12}+\dfrac{8\times3}{33\times4}=\dfrac{8\times15}{132}=\dfrac{120}{132}=\dfrac{10}{11}\)

2.\(\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)

3.\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}=\dfrac{5}{12}-\dfrac{7}{32}\times\dfrac{16}{21}=\dfrac{5}{12}-\dfrac{1}{6}=\dfrac{5-2}{12}=\dfrac{3}{12}=\dfrac{1}{4}\)

`@V.Tr.V`

`8/11+8/33xx3/4=8/11+2/11=10/11`

`7/9xx3/14:5/8=7/9xx3/14xx8/5=[7xx3xx4xx2]/[3xx3xx7xx2xx5]=4/[3xx5]=4/15`

`5/12-7/32:21/16=5/12-7/32xx16/21=5/12-2/12=3/12=1/4`

8/11 + 8/33 x 3/4 = 8/11 + 2/11 = 10/11

7/9 x 3/14 : 5/8 = 1/6 : 5/8 = 4/15

5/12 - 7/32 : 21/16 = 5/12 - 1/6 = 1/4

87/56

2/3

24/25

28

87/56

2/3

24/25

28

a \(\dfrac{24}{56}+\dfrac{63}{56}=\dfrac{87}{56}\)

b \(\dfrac{12}{15}-\dfrac{2}{15}=\dfrac{10}{15}=\dfrac{2}{3}\)

c \(\dfrac{8}{11}\times\dfrac{33}{5}=\dfrac{24}{5}\)

d \(4:\dfrac{1}{7}=4\times7=28\)

a)2/5+3/4

=23/20

b)2/5 + 3/10-1/2

=7/10-1/2

=1/5

c)8/11+8/33x3/4

=8/11 + 2/11

=10/11

tick cho mik nha mik cháy  đen túi r

hok tốt

8 /11 + 8 /33 × 3 /4 = 8 /11 + 2 /11 = 10 /11

8/11 + 2/11= 10/11 

\(\dfrac{4}{-33}-\dfrac{5}{11}+\dfrac{-4}{-33}+\dfrac{-8}{3}\)

\(=\dfrac{4}{-33}-\dfrac{5}{11}+\dfrac{4}{33}+-\dfrac{8}{3}\)

\(=\left(\dfrac{4}{-33}+\dfrac{4}{33}\right)+\left(-\dfrac{5}{11}+\dfrac{-8}{3}\right)\) 

\(=0+\left(\dfrac{-15}{33}+\dfrac{-88}{33}\right)\)

\(=0+\dfrac{-103}{33}=\dfrac{-103}{33}\)

\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{2}{11}=\dfrac{8+2}{11}=\dfrac{10}{11}\)

\(\dfrac{8}{11}+\dfrac{4.2}{11.3}.\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{2}{11}=\dfrac{10}{11}\)

8/11 + 8/33 x 3/4

=8/11 + 2/11

= 10/11

\(\dfrac{8}{11}-\dfrac{8}{44}\times\dfrac{3}{4}=\dfrac{8}{11}-\dfrac{8\times3}{33\times4}=\dfrac{8}{11}-\dfrac{2}{11}=\dfrac{6}{11}\)

\(\dfrac{8}{11}-\dfrac{2}{11}=\dfrac{6}{11}\)

\(\dfrac{8}{11}\) - \(\dfrac{8}{33}\) x \(\dfrac{3}{4}\) = \(\dfrac{8}{11}\) - \(\dfrac{2}{11}\) = \(\dfrac{6}{11}\)

a. -3/4 x 12/-5 x (-25/6)=-15/2

b. -2 x -38/21 x -7/4 x (-3/8)=-19/8

c. (11/12: 33/16) x 3/5=4/15

d. 7/23 x [(-8/6)- 45/18]=-7/6

a. -3/4 x 12/-5 x (-25/6)=-15/2

b. -2 x -38/21 x -7/4 x (-3/8)=-19/8

c. (11/12: 33/16) x 3/5=4/15

d. 7/23 x [(-8/6)- 45/18]=-7/6