65.4-(32.5+15.4)怎样简便 计算

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65.4-(32.5+15.4)怎样简便 计算
65.4-(32.5+15.4)怎样简便 计算

65.4-(32.5+15.4)怎样简便 计算
原式=65.4-15.4-32.5
=50-32.5
=17.5

=65.4-15.4-32.5
=50-32.5
=17.5

65.4-15.4-32.5=17.5