0.94*2.5-0.45怎样计算简便

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0.94*2.5-0.45怎样计算简便

0.94*2.5-0.45
=(1-0.06)x2.5-0.45
=1x2.5-0.06x2.5-0.45
=2.5-0.15-0.45
=2.5-0.6
=1.9