Đáp án:
happy new year
Giải thích các bước giải:
Bài 1:
a) A= $\frac{-3}{17}$ + ($\frac{2}{3}$ + $\frac{3}{17}$)
= $\frac{-3}{17}$ + $\frac{2}{3}$ + $\frac{3}{17}$
= ($\frac{-3}{17}$ + $\frac{3}{17}$)+ $\frac{2}{3}$
= 0 + $\frac{3}{17}$
= $\frac{3}{17}$
b) B= $\frac{-5}{21}$ + ($\frac{16}{21}$ + 1 )
= $\frac{-5}{21}$ + $\frac{16}{21}$ + 1
= $\frac{11}{21}$ + 1
= $\frac{32}{21}$
c) C= ($\frac{-1}{6}$ + $\frac{5}{12}$)+ $\frac{7}{12}$ +...?
Bài 2:
a) $\frac{-5}{8}$ - $\frac{7}{12}$
= $\frac{-15}{24}$ - $\frac{14}{24}$
= $\frac{-29}{24}$
b) $\frac{3}{4}$ + $\frac{-5}{6}$ - $\frac{11}{12}$
= $\frac{9}{12}$ + $\frac{-10}{12}$ - $\frac{11}{12}$
= -1
Bài 3:
a) $\frac{1}{6}$ - $\frac{1}{36}$
= $\frac{6}{36}$ - $\frac{1}{36}$
= $\frac{5}{36}$
b) $\frac{15}{48}$ - $\frac{-5}{12}$
= $\frac{15}{48}$ - $\frac{-20}{48}$
= $\frac{35}{48}$
