用简便方法计算下面各题6.45/8.2 645/1.8
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1.135+45+65
135+(45+65)
=135+110
=245
2.278-131-69
=278-(131+69)
=278-200
=78
3.25×32×125
=25*4*8*125
=100*1000
=100000
4.960÷32÷30
=960/(32*3)/10
=960/96/10
=1
5.42×168+42×32
=42*(168+32)
=42*200
=8400
6.44×25
=4*25*11
=100*11
=1100
135+(45+65)
=135+110
=245
2.278-131-69
=278-(131+69)
=278-200
=78
3.25×32×125
=25*4*8*125
=100*1000
=100000
4.960÷32÷30
=960/(32*3)/10
=960/96/10
=1
5.42×168+42×32
=42*(168+32)
=42*200
=8400
6.44×25
=4*25*11
=100*11
=1100
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