Question

Rút gọn phân số :

a/ \(\frac{-81}{504}\); \(\frac{-10101}{101010}\)

b/ \(\frac{72.5+72.3}{144.2+144.6}\)

Dấu . là dấu nhân nhé

Answer 1

a/ \(-\frac{81}{504}=-\frac{9}{56};-\frac{10101}{101010}=\frac{-1}{10}\)

b/ \(\frac{72\cdot5+72\cdot3}{144\cdot2+144\cdot6}=\frac{72\left(5+3\right)}{144\left(2+6\right)}=\frac{8}{2\cdot8}=\frac{1}{2}\)

Answer 2

\(\frac{-81}{504}=-\frac{81:9}{504:9}=-\frac{9}{56}\)

\(\frac{-10101}{101010}=\frac{-10101:10101}{101010:10101}=\frac{-1}{10}\)

\(\frac{72.5+72.3}{144.2+144.6}=\frac{72.\left(5+3\right)}{144\left(2+6\right)}=\frac{72.8}{144.8}=\frac{72.8}{72.2.8}=\frac{1}{2}\)

Answer 3

a. -9/56;-1/10

b 1/2