58.5×8.1＋11×1.25＋71×1.9＝
问题描述：
58.5×8.1＋11×1.25＋71×1.9＝
要简便计算的步骤
答
55.5*(10-1.9)+(10+1)*1.25+71*1.9
=555-55.5*1.9+12.5+1.25+71*1.9
=555+1.9(71-55.5)+12.5+1.25
=555+1.9*25.5+12.5+1.25
=555+(2-0.1)*25.5+12.5+1.25
=555+51-2.55+12.5+1.25
=606+13.75-2.55
=606+11.2
=617.2
是五年级的题!我做过
我是一个五年级的小学生