Question

6分之5乘13分之1加9分之5乘13分之2加18分之5乘13分之3怎么简算

Answer 1

原式=1/13(5/6+10/9+15/18)

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

=1/13(50)/18

=50/(13*18)

=50/(13*20-2*13)

=50/(260-26)

=50/234