Question

5/6*1/13+5/9*2/13+5/18*6/13这道题怎么简算,

Answer 1

原式=5/6*1/13+5/9*1/13*2+5/18*1/13*6

=5/6*1/13+10/9*1/13+5/3*1/13

=1/13(5/6+10/9+5/3)

=1/13*(15+20+30)/18

=1/13*65/18

=5/18