Question

Tính bằng cách thuận tiện 

12/13 + 2/7 + 8/13 + 5/7

Answer 1

\(\frac{12}{13}+\frac{2}{7}+\frac{8}{13}+\frac{5}{7}\)

\(=\frac{12}{13}+\frac{8}{13}+\frac{5}{7}+\frac{2}{7}\)

\(=\frac{20}{13}+1\)

\(=\frac{33}{13}\)

Answer 2

\(\frac{12}{13}+\frac{2}{7}+\frac{8}{13}+\frac{5}{7}\)

\(=\left(\frac{12}{13}+\frac{8}{13}\right)+\left(\frac{2}{7}+\frac{5}{7}\right)\)

\(=\frac{20}{13}+1\)

\(=\frac{33}{13}\)

Answer 3

\(\frac{12}{13}+\frac{2}{7}+\frac{8}{13}+\frac{5}{7}\)\(=\left(\frac{12}{13}+\frac{8}{14}\right)+\left(\frac{2}{7}+\frac{5}{7}\right)\)

                                              \(=\frac{20}{13}+1\)

                                                \(=\frac{33}{13}\)

Answer 4

\(\frac{12}{13}\)+ \(\frac{2}{7}\)+ \(\frac{8}{13}\)+ \(\frac{5}{7}\)= ( \(\frac{12}{13}\)+ \(\frac{8}{13}\)) + ( \(\frac{2}{7}\)+ \(\frac{5}{7}\))

=20/13 + 1 = 21//13

Answer 5

= ( 12/13 +8/13 ) + ( 2/7 + 5/7 )

=          20/13        +         1

= 33/13

Answer 6

Thank you!

Answer 7

Bang 33/ 13 nhe