跪求初一上半年先化简再求值的计算题,急用
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![跪求初一上半年先化简再求值的计算题,急用](/uploads/image/z/1665565-61-5.jpg?t=%E8%B7%AA%E6%B1%82%E5%88%9D%E4%B8%80%E4%B8%8A%E5%8D%8A%E5%B9%B4%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%E7%9A%84%E8%AE%A1%E7%AE%97%E9%A2%98%2C%E6%80%A5%E7%94%A8)
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