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数学
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定义一种运算:A@B=2A-3B+1.(1)5@2=( );(2)若10@X=9,则X=( )急急急急!
人气:466 ℃ 时间:2019-09-03 11:44:14
解答
2*5-3*2+1=5
20-3X+1=9,X=4那5@2=()???2*5-3*2+1=5
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