20.5*3.45+(3.67-2.39)简便计算 要求简便计算,

问答/498℃/2024-04-30 23:20:18

优质解答：

20.5*3.45+(3.67-2.39)

=(20+0.5)*3.45+1.28

=20*3.45+3.45/2+1.28

=69+1.725+1.28

=72.005

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