7.4 簡單小數(shù)的加、減法（1）1. 0.6+0.8= 10.3+2.5= 0.9+0.2= 3.8-0.9= 2.豎式計(jì)算下面各題。2.6+4.2= 5.6+1.8=3.連一連。0.8 3.7+4.22.1 1.4-0.67.9 5.9-2.73.2 1.6+0.5答案：1. 1.4 12.8 1.1 2.92. 3.0.8 3.7+4.22.1 1.4-0.67.9 5.9-2.73.2 1.6+0.5