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问题描述:
就一题数学能简算的要简算、帮帮忙啊
3.8÷3.9+3.9÷0.1+0.1÷3.9
3.8÷3.9+3.9÷0.1+0.1÷3.9 =(3.8+0.1)÷3.9+3.9÷0.1 =3.9÷3.9+39 =1+39 =40