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0.27 0.5 0.8简便计算

0.27*0.5*0.2=0.27*(0.5*0.2)=0.27*0.1=0.027

1.08x0.8÷0.27简便运算:1.08*0.8÷0.27=1.08÷0.27*0.8=4*0.8=3.2 解题思路:四则运算规则(按顺序计算,先算乘除后算加减,有括号先算括号,有乘方先算乘方)即脱式运算(递等式计算)需在该原则前提下进行.扩展资料 简便计算定律:1

(1)6.45*102,=6.45*100+6.45*2,=645+12.9,=657.9;(2)0.47*0.5*0.8,=0.47*(0.5*0.8),=0.47*0.4,=0.188;(3)0.46*1.9+0.54*1.9,=(0.46+0.54)*1.9,=1*1.9,=1.9;(4)0.027+9.9*0.27,=0.027+990.027,=0.027*(99+1),=0.027*100,=2.7;(5)15.8*69.3-68.3*15.8,=15.8*(69.3-68.3),=15.8*1,=15.8;(6)1.25*32*2.5.=(1.25*8)*(4*2.5),=10*10,=100.

1.25*1.62*0.8=1.25x0.8x1.62(根据乘法交换律和结合律简算:交换1.62和0.8的位置,1.25和0.8结合)=1x1.62=1.62

=0.47*(0.5*0.8)=0.47*0.4=0.188

1.08*0.8-0.27=0.27*4*0.8-0.27=0.27*3.2-0.27*1=0.27*(3.2-1)=0.27*2.2=0.54*1.1=0.54*(1+0.1)=0.54+0.054=0.594

1.08*0.8÷0.27=108/27*8/10=4*4/5=16/5=3.2

1.08*0.8除以0.27=0.27*4*0.8/0.27=0.27/0.27* 4*0.8=1*3.2=3.2

29+5.4/0.27*0.5=29+20*0.5=29+10=39

1.08*0.8/0.27=0.8*(1.08/0.27)=0.8*4=3.2

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