Đáp án+Giải thích các bước giải:

 `c)(-11/18);7/12;5/6`

`MSC:36`

`(-11)/18=(-11×2)/(18×2)=(-22)/18`

`7/12=(7×3)/(12×3)=21/36`

`5/6=(5×6)/(6×6)=25/36`

`d)(-3)/25;7/4;9/(-50)`

`MSC:100`

`(-3)/25=(-3×4)/(25×4)=(-12)/100`

`7/4=(7×25)/(4×25)=175/100`

`9/(-50)=(9×2)/(-50×2)=18/(-100)=(-18)/100`

$\text{Chúc cọu học tốt nha <3}$

`c)` MSC: `36`

$\dfrac{-11}{18}$`=`$\dfrac{-11.2}{18.2}$`=`$\dfrac{-22}{36}$

$\dfrac{7}{12}$`=`$\dfrac{7.3}{12.3}$`=`$\dfrac{21}{36}$

$\dfrac{5}{6}$`=`$\dfrac{5.6}{6.6}$`=`$\dfrac{30}{36}$

`d)` MSC: `100`

$\dfrac{-3}{25}$`=`$\dfrac{-3.4}{25.4}$`=`$\dfrac{-12}{100}$

$\dfrac{7}{4}$`=`$\dfrac{7.25}{4.25}$`=`$\dfrac{175}{100}$

$\dfrac{9}{-50}$`=`$\dfrac{-9}{50}$`=`$\dfrac{-9.2}{50.2}$`=`$\dfrac{-18}{100}$