50.4乘1.9-1.8的简便计算

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50.4乘1.9-1.8的简便计算50.4乘1.9-1.8的简便计算50.4乘1.9-1.8的简便计算50.4*(1.8+0.1)-1.8=(50.4-1)*1.8-50.4=49.4*1.8-50.

50.4乘1.9-1.8的简便计算
50.4乘1.9-1.8的简便计算

50.4乘1.9-1.8的简便计算
50.4*(1.8+0.1)-1.8
=(50.4-1)*1.8-50.4
=49.4*1.8-50.4
=88.92-50.4
=38.52

按部就班算,我觉得50.4*0.1已经够简便了,是不是题有问题还是你抄错了?