简便计算(要过程)
12×(6分之1+8分之3-3分之1)2又5分之1-2.17-1.83+2.821÷[6分之5+(4分之5-3分之1)]...
12×(6分之1+8分之3-3分之1) 2又5分之1-2.17-1.83+2.8 21÷[6分之5+(4分之5-3分之1)]
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2013-07-06 · 知道合伙人教育行家
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12×(6分之1+8分之3-3分之1)
=12×(1/6+3/8-1/3)
=12×1/6+12×3/8-12×1/3
=2+4.5-4
=2.5
2又5分之1-2.17-1.83+2.8
= 2.2-2.17-1.83+2.8
= 2.2+2.8 -(2.17+1.83 )
=5-4
=1
21÷ [6分之5+(4分之5-3分之1)]
=21÷(5/6+5/4-1/3)
=21÷(10/12+15/12-4/12)
=21÷21/12
=12
=12×(1/6+3/8-1/3)
=12×1/6+12×3/8-12×1/3
=2+4.5-4
=2.5
2又5分之1-2.17-1.83+2.8
= 2.2-2.17-1.83+2.8
= 2.2+2.8 -(2.17+1.83 )
=5-4
=1
21÷ [6分之5+(4分之5-3分之1)]
=21÷(5/6+5/4-1/3)
=21÷(10/12+15/12-4/12)
=21÷21/12
=12
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