问题 解答题 口算1.2×3=0.5×2=0.4×0.6=0.25×4=3.6÷9=4.2÷0.6=2÷4=8÷5= 答案 1.2×3=3.6,0.5×2=1,0.4×0.6=0.24,0.25×4=1,3.6÷9=0.4,4.2÷0.6=7,2÷4=0.5,8÷5=1.6.