Question

[Nguyễn Thị Hồng Nhung]

Rút gọn rồi tính :

a)4/6+18/27

b)15/25+6/21

Answer 1

[Nguyễn Thị Thùy Dung]

a,\(\frac{4}{6}+\frac{18}{27}=\frac{2}{3}+\frac{2}{3}=\frac{4}{3}\)

b,\(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)

Answer 2

[bui hoang viet]

a,4/6 = 2/3 ; 18/27 = 2/3 

ta có: 2/3 + 2/3 = 4/3

b,15/25 = 3/5 ; 6/21 = 2/7

ta có: 3/5 + 2/7 = 6/2