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若实数a,b,c满足2a+2b=2a+b,2a+2b+2c=2a+b+c,则c的...
若实数a,b,c满足2a+2b=2a+b,2a+2b+2c=2a+b+c,则c的最大值是 .
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,乙比甲成绩稳定,应选乙参加比赛
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