Đáp án:

Giải thích các bước giải:

`c`)

→$\dfrac{19}{12}$`:3+`$\dfrac{17}{36}$.

→$\dfrac{19}{36}$`+`$\dfrac{17}{36}$.

→`1`.

`d`)

→`0,75-`$\dfrac{3}{2}$`+0,5:`$\dfrac{5}{12}$.

→`0,75-`$\dfrac{3}{2}$`+`$\dfrac{6}{5}$.

→$\dfrac{9}{20}$.

`f`)

→$\dfrac{7}{5}$.($\dfrac{8}{19}$`+`$\dfrac{12}{19}$`-`$\dfrac{1}{19}$.

→$\dfrac{7}{5}$`.1`.

→$\dfrac{7}{5}$.

`g`)

→$\dfrac{-3}{5}$.($\dfrac{5}{7}$`+`$\dfrac{3}{7}$`+`$\dfrac{6}{7}$).

→$\dfrac{-6}{5}$.

`h`)

→$\dfrac{63}{10}$`-`($\dfrac{25}{7}$`+`$\dfrac{23}{10}$).

→$\dfrac{3}{10}$.

`k`)

→`66,1424-12,6424`.

→`53,5`

`m`)

→$\dfrac{1}{9}$`+`$\dfrac{11}{36}$`+`$\dfrac{7}{12}$.

→`1`.

Bài `2`.

`a`)

→`x=`$\dfrac{-5}{6}$`-`$\dfrac{2}{3}$.

→`x=``-1,5`.

`b`)

→`x-5,14=36`.

→`x=41,14`.

`c`)

→$\dfrac{1}{3}$`:x`=$\dfrac{3}{5}$`-`$\dfrac{2}{3}$.

→$\dfrac{1}{3}$`:x`=$\dfrac{-1}{15}$.

→`x=-5`.

`d`)

→$\dfrac{-2}{3}$`x`=$\dfrac{7}{12}$`-`$\dfrac{1}{2}$.

→`x=-0,125`.

`e`)

→$\dfrac{x}{5}$`=`$\dfrac{6}{10}$`-`$\dfrac{1}{2}$.

→$\dfrac{x}{5}$`=0,1`.

→`x=0,5`.

`f`).

→`3.(x+3)=15`.

→`3x+9=15`.

→`x=2`.

`g`)

→`3.(2x-5)=2.(x+3)`.

→`6x-15=2x+6`.

→`x=5,25`.

`h`)

→(`x+`$\dfrac{1}{5}$)=$\dfrac{3}{5}$.

`TH1`:`x+`$\dfrac{1}{5}$=$\dfrac{3}{5}$→`x=0,4`.

`TH2`:`x+`$\dfrac{1}{5}$=$\dfrac{-3}{5}$→`x=-0,8`