乘数里有4个负数 结果为正数 算式可以改为 8×12×0.125÷3×0.001=96×0.125÷3×0.001=12÷3×0.001=4×0.001=0.004
简便算法
=【（-8）×0.125】×【（-12）×1/3】×0.001
=（-1）×（-4）×0.001
=4×0.001
=0.004