Question

A) 12/25+3/5+13/25=

Answer 1

= \(\frac{8}{5}\)

Answer 2

=(12/25+13/25)+3/5

=25/25+15/25

=40/25

=8/5

Answer 3

12/25+3/5+13/25=12/25+15/25+13/25=12+15+13/25=40/25=8/5

Answer 4

Quy đồng lên:

=\(\frac{12}{25}\)+\(\frac{3\text{×}5}{5\text{×}5}\)+\(\frac{13}{25}\)=\(\frac{12}{25}\)+\(\frac{15}{25}\)+\(\frac{13}{25}\)=\(\frac{12+15+13}{25}\)=\(\frac{40}{25}\)=\(\frac{8}{5}\)