12.35乘37减123.5乘1.9加1.235乘820怎么简便运算?

问题描述:

12.35乘37减123.5乘1.9加1.235乘820怎么简便运算?

12.35*37-123.5*1.9+1.235*820
=[12.35*10(37/10)]-123.5*1.9+[1.235*100*(820/100)]

*乘号
/除号

12.35*37-123.5*1.9+1.235*820
=12.35*37-12.35*19+12.35*82
=12.35*(37-19+82)
=12.35*100
=1235