Question

14分之5×6分之5-12分之7×14分之5+20分之9×14分之5

Answer 1

5/14*5/6-7/12*5/14+9/20*5/14

=5/14*(5/6-7/12+9/20)

=5/14*(1/2+1/3-1/3-1/4+1/4+1/5)

=5/14*(1/2+1/5)

=5/14*7/10

=1/4