Đáp án:
Giải thích các bước giải:
Cách 1 :
(10 - $\frac{3}{11}$ + $\frac{1}{2}$) - (4 + $\frac{5}{11}$ - $\frac{3}{2}$ ) - (5 - $\frac{19}{21}$ + $\frac{5}{2}$)
= $\frac{225}{22}$ - $\frac{65}{22}$ - $\frac{277}{42}$
= $\frac{313}{462}$
Cách 2 :
(10 - $\frac{3}{11}$ + $\frac{1}{2}$) - (4 + $\frac{5}{11}$ - $\frac{3}{2}$ ) - (5 - $\frac{19}{21}$ + $\frac{5}{2}$)
= 10 - $\frac{3}{11}$ + $\frac{1}{2}$ - 4 - $\frac{5}{11}$ + $\frac{3}{2}$ - 5 + $\frac{19}{21}$ - $\frac{5}{2}$
= ( 10 - 4 - 5 ) + ( $\frac{-3}{11}$ - $\frac{5}{11}$ ) + ( $\frac{1}{2}$ + $\frac{3}{2}$ - $\frac{5}{2}$ ) + $\frac{19}{21}$
= 1 + $\frac{-8}{11}$ + $\frac{-1}{2}$ + $\frac{19}{21}$
= $\frac{462}{462}$ + $\frac{-336}{462}$ + $\frac{-231}{462}$ + $\frac{418}{462}$
= $\frac{313}{462}$
