用简便方法计算下列各题 5/3+4/1+5/2 12/11-(6/1-12/1)
用简便方法计算下列各题5/3+4/1+5/212/11-(6/1-12/1)7/3+(6/5+7/4)9/5-(9/4+10/1)16/9+8/3+16/7+8/19/4...
用简便方法计算下列各题
5/3+4/1+5/2
12/11-(6/1-12/1)7/3+(6/5+7/4)
9/5-(9/4+10/1)
16/9+8/3+16/7+8/1
9/4+5/3+9/5+2/1 展开
5/3+4/1+5/2
12/11-(6/1-12/1)7/3+(6/5+7/4)
9/5-(9/4+10/1)
16/9+8/3+16/7+8/1
9/4+5/3+9/5+2/1 展开
2个回答
2016-08-27 · 知道合伙人教育行家
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3/5+1/4+2/5
=(3/5+2/5)+1/4
=1+1/4
=1又1/4
11/12-(1/6-1/12)
=11/12+1/12-1/6
=1-1/6
=5/6
3/7+(5/6+4/7)
=3/7+4/7+5/6
=1+5/6
=1又5/6
9/5-(9/4+10/1)
5/9-(4/9+1/10)
=5/9-4/9-1/10
=1/9-1/10
=1/90
9/16+3/8+7/16+1/8
=(9/16+7/16)+(3/8+1/8)
=1+1/2
=1又1/2
4/9+3/5+5/9+1/2
=(4/9+5/9)+(3/5+1/2)
=1+11/10
=2又1/10
=(3/5+2/5)+1/4
=1+1/4
=1又1/4
11/12-(1/6-1/12)
=11/12+1/12-1/6
=1-1/6
=5/6
3/7+(5/6+4/7)
=3/7+4/7+5/6
=1+5/6
=1又5/6
9/5-(9/4+10/1)
5/9-(4/9+1/10)
=5/9-4/9-1/10
=1/9-1/10
=1/90
9/16+3/8+7/16+1/8
=(9/16+7/16)+(3/8+1/8)
=1+1/2
=1又1/2
4/9+3/5+5/9+1/2
=(4/9+5/9)+(3/5+1/2)
=1+11/10
=2又1/10
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