四点六乘一加四点六乘零点九等于四点六乘一点九等于八点七四!
4.6+4.6×0.9题目对吗?如对的,那就先乘后加,最简便 或4.6+4.6×(1-0.1) =4.6+4.6-0.46 =8.74
(4.5+0.1)×(2-0.1)=9-2.5×0.1-0.1×0.1=8.74
(4.6+4.6)(1-0.1)=9.2-0.92=9.2-(1-0.08)=8.2+0.08=8.28