填上合适的数【40.5-(2.1+ )÷0.3】×0.2=6.1怎么做
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填上合适的数【40.5-(2.1+)÷0.3】×0.2=6.1怎么做填上合适的数【40.5-(2.1+)÷0.3】×0.2=6.1怎么做填上合适的数【40.5-(2.1+)÷0.3】×0.2=6.1怎
填上合适的数【40.5-(2.1+ )÷0.3】×0.2=6.1怎么做
填上合适的数
【40.5-(2.1+ )÷0.3】×0.2=6.1怎么做
填上合适的数【40.5-(2.1+ )÷0.3】×0.2=6.1怎么做
用倒推法：
6.1÷0.2=30.5
40.5-30.5=10
10*0.3=3
3-2.1=0.9
填0.9