1212/1515 = 1212 :1515
= 12 x 101 : 15 x 101
= 12/15
dinh hoang vu
\(\frac{1212}{1515}=\frac{1212\div101}{1515\div101}\)
\(=\frac{12}{15}=\frac{4}{5}\)
\(\frac{1212}{1515}=\frac{2^2.3.101}{3.5.101}=\frac{2^2}{5}=\frac{4}{5}\)
\(\frac{1212}{1515}=\frac{12\cdot101}{15\cdot101}=\frac{12}{15}=\frac{4}{5}\)
Dấu " . " là dấu nhân nha bạn.
tinh bang cach thuan tien nhat phep tinh
xep theo thu tu tu lon den be 4/5;13/15;7/10;17/16