答对一题加十分,答错一题扣六分.三号选手共抢答16题,最后得分16分,他答对了几题?
用方程做,
人气：428 ℃ 时间：2020-05-20 00:46:01
解答
设三号选手答对了X道,则答错的题目为16-X道.
10X-6(16-X)=16
X=7
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