问题 解答题 口算. 2.5÷0.5=0.42÷0.6=3.5÷0.01=0.25×4=12.5×0.8=0.2×50= 答案 2.5÷0.5=5,0.42÷0.6=0.7,3.5÷0.01=350,0.25×4=1,12.5×0.8=10,0.2×50=10.