12.5*67+53*3.1+72*3.1怎样简便计算
问题描述:
12.5*67+53*3.1+72*3.1怎样简便计算
答
原式=125*6.7+3.1*(53+72)
=125*6.7+125*3.1
=125*9.8
=125*(10-0.2)
=1250-25
=1225