假设有10道选择题,做对一题加3分,做错一题减2分,最后得了20分,问做对了几道题.
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![假设有10道选择题,做对一题加3分,做错一题减2分,最后得了20分,问做对了几道题.](/uploads/image/z/88383-39-3.jpg?t=%E5%81%87%E8%AE%BE%E6%9C%8910%E9%81%93%E9%80%89%E6%8B%A9%E9%A2%98%2C%E5%81%9A%E5%AF%B9%E4%B8%80%E9%A2%98%E5%8A%A03%E5%88%86%2C%E5%81%9A%E9%94%99%E4%B8%80%E9%A2%98%E5%87%8F2%E5%88%86%2C%E6%9C%80%E5%90%8E%E5%BE%97%E4%BA%8620%E5%88%86%2C%E9%97%AE%E5%81%9A%E5%AF%B9%E4%BA%86%E5%87%A0%E9%81%93%E9%A2%98.)
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