20.07×1994-19.93×2007等于多少?用简便计算
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![20.07×1994-19.93×2007等于多少?用简便计算](/uploads/image/z/205161-33-1.jpg?t=20.07%C3%971994%EF%BC%8D19.93%C3%972007%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F%E7%94%A8%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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