3.24/0.5=3.24÷1/2=3.24*2=6.48
2.33*0.5*4 =4*0.5*2.33 =2*2.33 =4.66
0.5先乘0.2的0.1再乘3.24的0.324
2.1x3/4=2*3/4+0.1*3/4=1.5*0.075=1.575
3.24÷0.5可以理解为3.24除以二分之一,由此可以得出3.24*2,等于6.48.不管是什么数除以0.5,都可以理解为乘以2.
3.24*0.5*0.2=0.5*0.2*3.24=0.1*3.24=0.324 (乘法交换律)
原式=0.81*4*0.125=0.81*0.5=0.405
12.33*0点5*0点四简便计算12.33*0.5*0.4=12.33*(0.5*0.4)=12.33*0.2=2.466
(0.125x8-0.5)x4=(1-0.5)x4=0.5x4=2
3.24x0.5+0.324x8.5=3.24x0.5+3.24x0.85=3.24x(0.5+0.85)=3.24x1.35=4.374道理就是利用小数点移位,把0.324放大10被成3.24,使得和前面的3.24相同;同时8.5就得缩小10被变成0.85