用正负数表示实际问题中具有相反意义的量时,应注意两点:1 如想东想西;2它们都是?量
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![用正负数表示实际问题中具有相反意义的量时,应注意两点:1 如想东想西;2它们都是?量](/uploads/image/z/8765926-70-6.jpg?t=%E7%94%A8%E6%AD%A3%E8%B4%9F%E6%95%B0%E8%A1%A8%E7%A4%BA%E5%AE%9E%E9%99%85%E9%97%AE%E9%A2%98%E4%B8%AD%E5%85%B7%E6%9C%89%E7%9B%B8%E5%8F%8D%E6%84%8F%E4%B9%89%E7%9A%84%E9%87%8F%E6%97%B6%2C%E5%BA%94%E6%B3%A8%E6%84%8F%E4%B8%A4%E7%82%B9%EF%BC%9A1+%E5%A6%82%E6%83%B3%E4%B8%9C%E6%83%B3%E8%A5%BF%EF%BC%9B2%E5%AE%83%E4%BB%AC%E9%83%BD%E6%98%AF%3F%E9%87%8F)
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