用简便方法计算下面各题.6.81+6.81×990.25×185×40.
1个回答
6.81+6.81×99
=(99+1)×6.81,
=100×6.81,
=681;
0.25×185×40
=0.25×4×10×185,
=1×10×185,
=1850.
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6.81+6.81×99脱式计算