Question

6分之5乘13分之1+9分之5乘13分之2 +18分之5乘13分之6 简算

Answer 1

5/6×1/13+5/9×2/13+5/18×6/13

=5/6×1/13×(1+4/3+2)

=5/6×1/13×13/3

=5/6×1/3

=5/18