1、7/25×4/9+7/25×5/9

=7/25×(4/9+5/9)

=7/25×1

=7/25

2、60×(1/12+1/15+1/4)

=60×1/12+60×1/15+60×1/4

=5+4+15

=24

3、(5/12-3/8)×72

=5/12×72-3/8×72

=30-27

=3

4、6/7-5/24÷7/12

=6/7-5/24×12/7

=12/14-5/14

=7/14

=1/2

5、[3/4×(7/16-1/4)]÷9/13

=3/4×（7/16-4/16）×13/9

=1/4×3/16×13/3

=13/64

6、2/3-7/8+1/3

=(2/3+1/3)-7/8

=1-7/8

=1/8

7、5/6-(3/7-1/6)

=(5/6+1/6)-3/7

=1-3/7

=4/7

8、1-1/3-2/3

=1-(1/3+2/3)

=1-1

=0

9、1+3/5-1/10

=1+6/10-1/10

=1+1/2

=1又1/2

10、3/8-12/13+5/8

=3/8+5/8-12/13

=1-12/13

=1/13