15.5+26.5-20.5的简便计算
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15.5+26.5-20.5的简便计算
15.5+26.5-20.5的简便计算
15.5+26.5-20.5的简便计算
=26.5-(20.5-15.5)
=26.5-5
=21.5
26.5-20.5=6+15.5=21.5
15.5+26.5-20.5的简便计算
15.5+26.5-20.5的简便计算
15.5+26.5-20.5的简便计算
=26.5-(20.5-15.5)
=26.5-5
=21.5
26.5-20.5=6+15.5=21.5