五年级分数简算题

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

5/6-(3/7-1/6)
=(5/6+1/6)-3/7
=1-3/7
=4/7

1-1/3-2/3
=1-(1/3+2/3)
=1-1
=0

1+3/5-1/10
=1+6/10-1/10
=1+1/2
=1又1/2

3/8-12/13+5/8
=3/8+5/8-12/13
=1-12/13
=1/13

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

1-1/2-1/4
=1/2-1/4
=2/4-1/4
=1/4

2/7-8/9+5/7
=(2/7+5/7)-8/9
=1-8/9
=1/9

2-1/4-3/4
=2-(1/4+3/4)
=2-1
=1

1/2-(3/8-1/2)
=1/2+1/2-3/4
=1-3/8
=5/8

3/7-5/8+4/7
=3/7+4/7-5/8
=1-5/8
=3/8

1/2-1/3+1/2
=1/2+1/2-1/3
=1-1/3
=2/3

3/4-(1/2-1/4)
=3/4+1/4-1/2
=1-1/2
=1/2

3/5+4/5-2/5
=7/5-2/5
=1

1/6-(3/4-5/6)
=1/6+5/6-3/4
=1-3/4
=1/4

1/9-(1/8-8/9)
=1/9+8/9-1/8
=1-1/8
=7/8

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