Question

3,9*5,48+3,9*5,42 решите по действиям

Answer 1

3,9*5,48+3,9*5,42=3,9*(5,48+5,42)=3,9*10,9=42,51
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Answer 2

1)3,9*5,48=21,372;
2)3,9*5,42=21,138;
3)21,372+21,138=42,51.