3/7x3/13+3/7:13/10+6/14
=3/7x3/13+3/7x10/13+6/14
=3/7x(3/13+10/13)+6/14
=3/7x1+6/14
=3/7+6/14
=3/7+3/7
=6/7
Đề:...........
= 3/7 x 3/13 + 3/7 x 10/13 + 3/7
= 3/7 x (3/13 + 10/13 + 1)
= 3/7 x ( 1 + 1 )
= 3/7 x 2
= 6/7
\(\frac{3}{7}\cdot\frac{3}{13}+\frac{3}{7}:\frac{13}{10}+\frac{6}{14}\)
\(=\frac{3}{7}\cdot\frac{3}{13}+\frac{3}{7}\cdot\frac{10}{13}+\frac{3}{7}\)
\(=\frac{3}{7}\left(\frac{3}{13}+\frac{10}{13}+1\right)\)
\(=\frac{3}{7}\cdot2\)
\(=\frac{6}{7}\)