数学有几道题,不会呀,教一下.❶已知:a+b=40.1 b+c=51.4 a+c=28.5求a,b,c格是多少.❷在下列算式中填上0〜9这是个数字,不能重复. (?)(?).(?)(?)(?) ➖(?)(?).(?)(?)(?)_________________
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