我用交叉法哪里错了,还是答案错了,
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![我用交叉法哪里错了,还是答案错了,](/uploads/image/z/11202812-44-2.jpg?t=%E6%88%91%E7%94%A8%E4%BA%A4%E5%8F%89%E6%B3%95%E5%93%AA%E9%87%8C%E9%94%99%E4%BA%86%2C%E8%BF%98%E6%98%AF%E7%AD%94%E6%A1%88%E9%94%99%E4%BA%86%2C)
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