Question

[Nguyễn Mai Linh]

Tính nhanh

a)121212/151515+1414/2121

b)23,4×46,7+27,15×46,8-23,4

Answer 1

[vo phi hung]

a)121212/151515 + 1414/2121

= 4/5                     +    2/3

= 22/15

Answer 2

[Minh Nguyễn Cao]

a) \(\frac{121212}{151515}+\frac{1414}{2121}=\frac{12}{15}+\frac{14}{21}=\frac{12}{15}+\frac{2}{3}=\frac{12}{15}+\frac{10}{15}=\frac{22}{15}\)