Đáp án:
a) 1
b) $\frac{7}{6}$
c) 10
Giải thích các bước giải:
a) $\frac{9}{11}$ - $\frac{7}{8}$ + $\frac{13}{11}$ + $\frac{-1}{8}$
= ( $\frac{9}{11}$+ $\frac{13}{11}$ ) + ( $\frac{-7}{8}$ + $\frac{-1}{8}$ )
= 2 + -1
= 1
b) $\frac{7}{12}$ . $\frac{2}{3}$ - $\frac{5}{3}$ . $\frac{7}{12}$ + $\frac{7}{12}$ . 3
= $\frac{7}{12}$ . ( $\frac{2}{3}$ - $\frac{5}{3}$ = 3 )
= $\frac{7}{12}$ . 2
= $\frac{7}{6}$
c) ( 2 $\frac{7}{12}$ + 4 $\frac{1}{3}$ ) + 3 $\frac{1}{12}$
= 2 $\frac{7}{12}$ + 4 $\frac{1}{3}$ + 3 $\frac{1}{12}$
= ( 2 $\frac{7}{12}$ + 3 $\frac{1}{12}$ )+ 4 $\frac{1}{3}$
= 5 $\frac{2}{3}$ + 4 $\frac{1}{3}$
= 10
