Question

Rút gọn rồi quy đồng mãu các phân số:

a)   \(\frac{-15}{90},\frac{120}{600},\frac{-75}{150}\)

b)    \(\frac{54}{-90},\frac{-180}{288},\frac{60}{-135}\)

Answer 1

a. \(-\frac{15}{90}=-\frac{1}{6};\frac{120}{600}=\frac{1}{5};-\frac{75}{150}=-\frac{1}{2}\)

Mẫu chung: 30

\(-\frac{1}{6}=-\frac{5}{30};\frac{1}{5}=\frac{6}{30};-\frac{1}{2}=-\frac{15}{30}\)

b. \(\frac{54}{-90}=\frac{3}{-5}=-\frac{3}{5};-\frac{180}{288}=-\frac{5}{8};\frac{60}{-135}=\frac{4}{-9}=-\frac{4}{9}\)

Mẫu chung: 360

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

Answer 2

ko biet gi ca

Answer 3

anh ko biet