5.28+0.72*9用简便方法计算!
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5.28+0.72*9用简便方法计算!5.28+0.72*9用简便方法计算!5.28+0.72*9用简便方法计算!5.28+0.72×9=5.28+0.72×(10-1)=5.28+0.72×10-0
5.28+0.72*9用简便方法计算!
5.28+0.72*9用简便方法计算!
5.28+0.72*9用简便方法计算!
5.28+0.72×9
=5.28+0.72×(10-1)
=5.28+0.72×10-0.72×1
=5.28+7.2-0.72
=12.48-0.72
=12.48-1+0.28
=11.48+0.28
=11.66