Question

0.42X160+36X1.6-34X3.2简便算法

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Answer 1

原式=0.42X160+0.36X160-34X3.2=160（0.42+0.36)-34X3.2=160X0.78-34X3.2=3.2(39-34)=3.2X6=16

Answer 2

0.42X160+36X1.6-34X3.2=1.6*42+1.6*36+1.6*34*2=1.6*（42+36-34*2）=1.6*10=16

Answer 3

原式＝2.1×32+1.8×32-3.4×32＝（2.1+1.8-3.4）×32＝0.5×32＝16