运用公式法 -2xy-x²-y²x²-x+4分之1是不是完全平方式 9a²b²-3ab+1 呢 4分之1m²+3mn+9n² 呢x六次方-10x三次方-25呢
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![运用公式法 -2xy-x²-y²x²-x+4分之1是不是完全平方式 9a²b²-3ab+1 呢 4分之1m²+3mn+9n² 呢x六次方-10x三次方-25呢](/uploads/image/z/765860-68-0.jpg?t=%E8%BF%90%E7%94%A8%E5%85%AC%E5%BC%8F%E6%B3%95+-2xy-x%26%23178%3B-y%26%23178%3Bx%26%23178%3B-x%2B4%E5%88%86%E4%B9%8B1%E6%98%AF%E4%B8%8D%E6%98%AF%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%BC%8F+9a%26%23178%3Bb%26%23178%3B-3ab%2B1+%E5%91%A2+4%E5%88%86%E4%B9%8B1m%26%23178%3B%2B3mn%2B9n%26%23178%3B+%E5%91%A2x%E5%85%AD%E6%AC%A1%E6%96%B9-10x%E4%B8%89%E6%AC%A1%E6%96%B9-25%E5%91%A2)
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