问题 解答题 直接写出得数.7.2+0.78=0.36+0.64=0.96÷0.3=12×2.5=8-2.5=8.4÷4.2=1.25×0.8=7.8-0.54= 答案 7.2+0.78=7.980.36+0.64=10.96÷0.3=3.212×2.5=308-2.5=5.58.4÷4.2=21.25×0.8=17.8-0.54=7.26