Question

Bài 2: Rút gọn rồi quy đồng các phân số sau:
a)20/45;14/-35;-32/44 b)-15/90;120/600;-75/150
c)54/-90;-180/288;60/-135 d)3.4+3.11/9.2+3 và 8.3-3.2/4.7-2.6

Answer 1

a)

20/45=4/9

14/-35=-2/5

-32/44=-8/11

\(\frac{4}{9}-\frac{2}{5}-\frac{8}{11}=\frac{220-198-360}{495}=\frac{-338}{495}\)

Answer 2

b)

-15/90=-1/6

120/600=1/5

-75/150=-1/2

\(\frac{-1}{6}+\frac{1}{5}-\frac{1}{2}=\frac{-5+6-15}{30}=\frac{-14}{30}=\frac{-7}{15}\)

Answer 3

c)

54/-90=-3/5

-180/288=-5/8

60/-135=-4/9

\(\frac{-3}{5}-\frac{5}{8}-\frac{4}{9}=\frac{-216-225-160}{360}=\frac{-601}{360}\)