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简便计算方法
3个回答
展开全部
5/12-(1/12-1/2)
=5/12-1/12+1/2
=1/3+1/2
=5/6
1/5+1/2+4/5
=(1/5+4/5)+1/2
=1+1/2
=1又1/2
2-5/11-6/11
=2-(5/11+6/11)
=2-1
=1
9/7+1/6+5/6+5/7
=(9/7+5/7)+(1/6+5/6)
=2+1
=3
13/5-(13/5-2/5)
=13/5-13/5+2/5
=0+2/5
=2/5
8/9-(2/9+1/3)
=8/9-2/9-1/3
=2/3-1/3
=1/3
7.8-8.75+2.2-1.25
=(7.8+2.2)-(8.75+1.25)
=10-10
=0
7.8×1.17-7.8-0.17
=7.8×(1.17-0.17)
=7.8×1
=7.8
60.62-(9.2+12.62)
=60.62-12.62-9.2
=50-9.2
=40.8
7-3/7-4/7
=7-(3/7+4/7)
=7-1
=6
13/17-(5/17+1/10)
=13/17-5/17-1/10
=8/17-1/10
=63/170
1/5+(5/6+13/18)
=1/5+1又5/9
=1又34/45
=5/12-1/12+1/2
=1/3+1/2
=5/6
1/5+1/2+4/5
=(1/5+4/5)+1/2
=1+1/2
=1又1/2
2-5/11-6/11
=2-(5/11+6/11)
=2-1
=1
9/7+1/6+5/6+5/7
=(9/7+5/7)+(1/6+5/6)
=2+1
=3
13/5-(13/5-2/5)
=13/5-13/5+2/5
=0+2/5
=2/5
8/9-(2/9+1/3)
=8/9-2/9-1/3
=2/3-1/3
=1/3
7.8-8.75+2.2-1.25
=(7.8+2.2)-(8.75+1.25)
=10-10
=0
7.8×1.17-7.8-0.17
=7.8×(1.17-0.17)
=7.8×1
=7.8
60.62-(9.2+12.62)
=60.62-12.62-9.2
=50-9.2
=40.8
7-3/7-4/7
=7-(3/7+4/7)
=7-1
=6
13/17-(5/17+1/10)
=13/17-5/17-1/10
=8/17-1/10
=63/170
1/5+(5/6+13/18)
=1/5+1又5/9
=1又34/45
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