11/12-5/12=6/12=1/2

25/24-16/24=9/24=3/8

27/36-15/36=12/36=2/3

k cho mik nhé

a) \(\dfrac{2}{5}=\dfrac{2\times5}{5\times2}=\dfrac{10}{25}\)

\(\dfrac{4}{7}=\dfrac{4\times2}{7\times2}=\dfrac{8}{14}\)

b) \(\dfrac{36}{40}=\dfrac{36:4}{40:4}=\dfrac{9}{10}\)

\(\dfrac{24}{32}=\dfrac{24:8}{32:8}=\dfrac{3}{4}\)

=(11/24 + 13/24) + (-5/41 - 36/41) + 0.5
=           1             +          (-1) +    0.5
=                      0 + 0.5 
=               0.5 

\(\dfrac{36}{x^6}-\dfrac{24}{x^3}+4=\left(\dfrac{6}{x^3}\right)^2-2.\dfrac{6}{x^3}.2+2^2=\left(\dfrac{6}{x^3}-2\right)^2=4\left(\dfrac{3}{x^3}-1\right)\)

a: \(\Leftrightarrow\dfrac{16}{x}=\dfrac{-4}{5}\)

hay x=-20

b: =>x+7=-10

hay x=-17

a  x=-20

 b  x=-17

\(-\dfrac{28}{35}=\dfrac{16}{x}\Leftrightarrow-\dfrac{4}{5}=\dfrac{16}{x}\)

\(\Rightarrow-4x=5\cdot16\)

\(\Rightarrow-4x=80\)

\(\Rightarrow x=-20\)

\(\dfrac{x+7}{15}=-\dfrac{24}{36}\Leftrightarrow\)\(\dfrac{x+7}{15}=-\dfrac{2}{3}\)

\(\Rightarrow3\left(x+7\right)=-2\cdot15\)

\(x+7=-30\div3\)

x+7=-10

x=-10-7

x=-17

\(\dfrac{15}{25}=\dfrac{15:5}{25:5}=\dfrac{3}{5}\\ \dfrac{24}{28}=\dfrac{24:4}{28:4}=\dfrac{6}{7}\\ \dfrac{18}{33}=\dfrac{18:3}{33:3}=\dfrac{6}{11}\\ \dfrac{12}{36}=\dfrac{12:12}{36:12}=\dfrac{1}{3}.\)

\(\dfrac{15}{25}=\dfrac{3}{5}\)

\(\dfrac{24}{28}=\dfrac{6}{7}\)

\(\dfrac{18}{33}=\dfrac{6}{11}\)

\(\dfrac{12}{36}=\dfrac{1}{3}\)

\(\dfrac{15}{25}=\dfrac{15:5}{25:5}=\dfrac{3}{5}\\ \dfrac{24}{28}=\dfrac{24:4}{28:4}=\dfrac{6}{7}\\ \dfrac{18}{33}=\dfrac{18:3}{33:3}=\dfrac{6}{11}\\ \dfrac{12}{36}=\dfrac{12:12}{36:12}=\dfrac{1}{3}\)

`(5/6 -x+7/12) : ( 11/24 -1/8)=11/36`

`=>(5/6 -x+7/12) : (11/24 - 3/24)=11/36`

`=>(5/6 -x+7/12) : 8=11/36`

`=>5/6 -x+7/12=11/36 xx 8`

`=>5/6 -x+7/12=22/9`

`=> x+7/12=5/6-22/9`

`=> x+7/12=-29/18`

`=>x=-29/18 -7/12`

`=>x=-79/36`

79/36 nhé

\(\dfrac{36}{24}=1,5;\dfrac{21}{15}=1,4\)

\(\dfrac{36}{24}=1,5\)

\(\dfrac{21}{15}=1,4\)

\(\dfrac{36}{24}=1,5;\dfrac{21}{15}=1,4\)