0.8×2.7-0.5怎么简便
2个回答
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0.8*2.7-0.5
=0.8*2.7-0.4-0.1
=0.8*2.7-0.8*0.5-0.1
=0.8*2.2-0.1
=1.6*1.1-0.1
=1.6+0.16-0.1
=1.6+0.06
=1.66
=0.8*2.7-0.4-0.1
=0.8*2.7-0.8*0.5-0.1
=0.8*2.2-0.1
=1.6*1.1-0.1
=1.6+0.16-0.1
=1.6+0.06
=1.66
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