2.61*39.5+0.318*261+2.87*26.1怎样简便计算
问题描述:
2.61*39.5+0.318*261+2.87*26.1怎样简便计算
答
2.61*39.5+0.318*261+2.87*26.1=2.61*39.5+31.8*2.61+28.7*2.61
=2.61*(39.5+31.8+28.7)=2.61*100=261