Question

几道简便 6分之5×13分之1＋9分之5×13分之2＋18分之5×13分之6 （9又7分之2＋7又9分之2）÷（7分之5

Answer 1

=5/6×1/13+10/9×1/13+5/3×1/13

=(5/6+10/9+5/3)×1/13

=65/18×1/13

=5/18

=(65/7+65/9)/(5/7+5/9)

=13×(5/7+5/9)/(5/7+5/9)

=13

下次在这么多我不做了