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?
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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,7,13/45 13/15
5/56 8
1/12
41/48 2/7 5/24,2,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
11/12-5/16+1/4= 2/21+1/3-1/7= 3/4-(1/6+3/8)
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,7,13/45 13/15
5/56 8
1/12
41/48 2/7 5/24,2,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
11/12-5/16+1/4= 2/21+1/3-1/7= 3/4-(1/6+3/8)
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