Question

分数乘除法 1.7/10-2/7÷5/7 2.5/8*1/4+1/4*3/8 3.（1/2-1/3）÷5/6+1/3 4

Answer 1

7/10-2/7÷5/7

=0.7-2/7*7/5

=0.7-2/5

=0.7-0.4

=0.3

5/8*1/4+1/4*3/8

=1/4*(5/8+3/8)

=1/4*1

=1/4

（1/2-1/3）÷5/6+1/3

=1/6*6/5+1/3

=1/5+1/3

=8/15

4/5*（5/6-3/4）-1/15

=4/5*5/6-4/5*3/4-1/15

=4/6-3/5-1/15

=10/15-9/15-1/15

=0