问题 解答题
口算:
80×0.3=1.1×0.9=7.1÷0.1=2.5×0.04=
0.2÷0.4=4.2÷2.1=0.45÷45=2×0.5-2×0.5=
答案

80×0.3=24,1.1×0.9=0.99,7.1÷0.1=71,2.5×0.04=0.1,
0.2÷0.4=0.5,4.2÷2.1=2,0.45÷45=0.01,2×0.5-2×0.5=0.

问答题
单项选择题