题目

口算。0.24÷0.6＝      4.2÷0.01＝              70÷0.5＝0÷9.84＝        0.28×5＋0.72×5＝       10.78×0.75×0＝ 答案：解：0.24÷0.6＝0.4；4.2÷0.01＝420；70÷0.5＝140；0÷9.84＝0；0.28×5＋0.72×5＝5；10.78×0.75×0＝0

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