7/8+3/4-11/12简便计算急5/9+7/12+4/9=9/10-(2/5+1/4)=7/8-5/12+5/6=4/5+3/10-11/20=3/5-(5/8-1/6)=3/4-2/7+1/4+2/7=、11/9+3/10-2/9+7/10=22/15+7/13+8/15-7/13=

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7/8+3/4-11/12简便计算急5/9+7/12+4/9=9/10-(2/5+1/4)=7/8-5/12+5/6=4/5+3/10-11/20=3/5-(5/8-1/6)=3/4-2/7+1/4+2/7=、11/9+3/10-2/9+7/10=22/15+7/13+8/15-7/13=
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7/8+3/4-11/12简便计算急5/9+7/12+4/9=9/10-(2/5+1/4)=7/8-5/12+5/6=4/5+3/10-11/20=3/5-(5/8-1/6)=3/4-2/7+1/4+2/7=、11/9+3/10-2/9+7/10=22/15+7/13+8/15-7/13=
7/8+3/4-11/12简便计算急
5/9+7/12+4/9
=
9/10-(2/5+1/4)
=
7/8-5/12+5/6
=
4/5+3/10-11/20
=
3/5-(5/8-1/6)
=
3/4-2/7+1/4+2/7
=、
11/9+3/10-2/9+7/10
=
22/15+7/13+8/15-7/13
=

7/8+3/4-11/12简便计算急5/9+7/12+4/9=9/10-(2/5+1/4)=7/8-5/12+5/6=4/5+3/10-11/20=3/5-(5/8-1/6)=3/4-2/7+1/4+2/7=、11/9+3/10-2/9+7/10=22/15+7/13+8/15-7/13=
5/9+7/12+4/9
=(5/9+4/9)+7/12
=9/9+7/12
=1+7/12
=1又7/12
9/10-(2/5+1/4)
=9/10-2/5-1/4
=9/10-4/10-1/4
=5/10-1/4
=1/2-1/4
=12/4-1/4
=1/4
7/8-5/12+5/6
=7/8-5/12+10/12
=7/8+5/12
=21/24+10/24
=31/24
4/5+3/10-11/20
=4/5+6/20-11/20
=4/5-5/20
=16/20-5/20
=11/20
3/5-(5/8-1/6)
=3/5-(15/24-4/24)
=3/5-11/24
=72/120-55/120
=17/120
3/4-2/7+1/4+2/7
=3/4+1/4-(2/7+2/7)
=1
11/9+3/10-2/9+7/10
=(11/9-2/9)+(3/10+7/10)
=9/9+10/10
=1+1
=2
22/15+7/13+8/15-7/13
=(22/15+8/15)+(7/13-7/13)
=30/15
=2