Question

直接写出得数2/5-1/9= 3/5+4/15=5/7-5/8= 8-1/2+1/2=1/4-1/6=2.计算下列各题1

Answer 1

2/5-1/9= 13/45 3/5+4/15=13/15

5/7-5/8= 5/56 8-1/2+1/2=8

11/12-5/16+1/4=

11/12+1/4-5/16

=7/6-5/16

=41/48

2/21+1/3-1/7

=1/3+(2/21-1/7)

=1/3-1/21

=2/7

3/4-(1/6+3/8)

=3/4-13/24

=5/24

望采纳