bài 1;
a) -2/33+5/55 b) -3/26+2 4/69 c) -1/12-(2 5/8-1/3)
(hỗn số) (hỗn số)
d) -1,75-9-(1/9-2 1/18)
(hỗn số)
e) -5/6-(-3/8+1/10) f) 2/5+(-4/3)+(-1/2) g) 3/12-(6/15-3/10)
bài 1; a) -2/33+5/55 b) -3/26+2 4/69 c) -1/12-(2 5/8-1/3) (hỗn số)
By Isabelle
$a) \dfrac{-2}{33} + \dfrac{5}{55} = \dfrac{1}{33}$
$b) \dfrac{-3}{26} + 2\dfrac{4}{69} = 1,9$
$c) \dfrac{-1}{12} – (2\dfrac{5}{8} – \dfrac{1}{3}) = \dfrac{-19}{8}$
$d) -1,75 – 9 – (\dfrac{1}{9} – 2\dfrac{1}{18}) = \dfrac{-317}{36}$
$e) \dfrac{-5}{6} – (\dfrac{-3}{8} + \dfrac{1}{10}) = \dfrac{-67}{120}$
$f) \dfrac{2}{5} + (\dfrac{-4}{3}) + (\dfrac{-1}{2}) = \dfrac{-43}{30}$
$g) \dfrac{3}{12} – (\dfrac{6}{15} – \dfrac{3}{10}) = \dfrac{3}{20}$
$a) \dfrac{-2}{33} + \dfrac{5}{55} = \dfrac{-2}{33} + \dfrac{1}{11} = \dfrac{1}{33}$
$b) \dfrac{-3}{26} + 2\dfrac{4}{69} = 1,9$
$c) \dfrac{-1}{12} – (2\dfrac{5}{8} – \dfrac{1}{3}) = \dfrac{-19}{8}$
$d) -1,75 – 9 – (\dfrac{1}{9} – 2\dfrac{1}{18}) = -1,75 – 9 – (\dfrac{-35}{18}) = \dfrac{-317}{36}$
$e) \dfrac{-5}{6} – (\dfrac{-3}{8} + \dfrac{1}{10}) = \dfrac{-5}{6} – (\dfrac{-11}{40}) = \dfrac{-67}{120}$
$f) \dfrac{2}{5} + (\dfrac{-4}{3}) + (\dfrac{-1}{2}) = \dfrac{-43}{30}$
$g) \dfrac{3}{12} – (\dfrac{6}{15} – \dfrac{3}{10}) = \dfrac{1}{4} – \dfrac{1}{10} = \dfrac{3}{20}$