问题 解答题 口算30×0.5=0.36÷3=2.05×5=2.16+3.84=82=10-3.3=2.5×4=6÷5= 答案 30×0.5=15,0.36÷3=0.12,2.05×5=10.25,2.16+3.84=6,82=64,10-3.3=6.7,2.5×4=10,6÷5=1.2.