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4.2x0.5简单算法

4.2*0.5=4.2*1/2=4.2÷2=2.1

4.2*0.5 =4*0.5+0.2*0.5=2+0.1=2.1

4.2*0.5=4.2*(1/2)=2.1

问:4.2X0.51.6X0.5简便计算 答4.2*0.51.6*0.5=9(4.2-1.6)*0.5=2.6*0.5=1.3

5.8+4.2x0.5=5.8+(4+0.2)x0.5=5.8+2+0.1=7.9

=4*0.25+0.2*0.25=1+0.5 =1.5

0.8*1.7*0.5=0.8*0.5*1.7=0.4*1.7=0.68

解:4.2x0.5=4.2÷2=2.1

=4.2x(1+0.5)-2.74=4.2*1+4.2x0.5-2.74=4.2+2.1-2.74=6.3-2.74=3.56

3.5-3.5*0.5 =3.5*(1-0.5) =3.5*0.5 =1.75 你好,本题已解答,如果满意 请点右上角“采纳答案”.

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