2.006*390-20.06*41+200.6*0.2的简便运算怎嘛写

问题描述:

2.006*390-20.06*41+200.6*0.2的简便运算怎嘛写

原式=20.06*39-20.06*41+20.06*2
=20.06*(39-41+2)
=20.06*0
=0