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?
答
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