有关x2x210的精选大全

方程+x+2x=210的解为(  )A.x=20                     B.x=40    ...
问题详情:方程+x+2x=210的解为()A.x=20                     B.x=40                     C.x=60                     D.x=80【回答】C【解析】先合并同...
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