Bài 1:
$\frac{7}{3}$ - ( x + $\frac{5}{3}$ ) = $\frac{-12}{5}$
⇒ $\frac{7}{3}$ - x - $\frac{5}{3}$ = $\frac{-12}{5}$
⇒ $\frac{2}{3}$ - x = $\frac{-12}{5}$
⇒ x = $\frac{2}{3}$ - $\frac{-12}{5}$
⇒ x = $\frac{46}{15}$
Vậy x = $\frac{46}{15}$
Bài 2:
a) $\frac{-25}{13}$ + ($\frac{-9}{17}$) + $\frac{12}{13}$ + ($\frac{-25}{17}$)
= ( $\frac{-25}{13}$ + $\frac{12}{13}$) + [ $\frac{-9}{17}$ + ($\frac{-25}{17}$) ]
= - 1 + ( -2 )
= -3
b) $\frac{2}{3}$ + $\frac{-1}{-4}$ + $\frac{1}{21}$ + $\frac{1}{12}$
= ( $\frac{2}{3}$ + $\frac{1}{21}$ ) + ( $\frac{-1}{-4}$ + $\frac{1}{12}$ )
= $\frac{5}{7}$ + $\frac{1}{3}$
= $\frac{22}{21}$
#Chúc bạn 1 ngày tốt lành !!
