2.9×1.2+1.2+6.1×1.2怎么简算?2.9×1.2+1.2+6.1×1.2怎么简算?
2.9×1.2+1.2+6.1×1.2怎么简算?..2.9×1.2+1.2+6.1×1.2 =(2.9+1+6.1)*1.2 =10*1.2 =12