25.5-(1.9+5.5)怎么简便计算
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25.5-(1.9+5.5)怎么简便计算25.5-(1.9+5.5)怎么简便计算25.5-(1.9+5.5)怎么简便计算解由25.5-(1.9+5.5)=25.5-1.9-5.5=25.5-5.5-1
25.5-(1.9+5.5)怎么简便计算
25.5-(1.9+5.5)怎么简便计算
25.5-(1.9+5.5)怎么简便计算
解由
25.5-(1.9+5.5)
=25.5-1.9-5.5
=25.5-5.5-1.9
=20-1.9
=18.1
去括号 25.5-5.5-1.9=20-1.9=18.1
25.5-(1.9+5.5)
=25.5-5.5-1.9
=20-2+0.1
=18.1