1.已经知道 x+y=3 xy=1,求x²+y²的值2.(a+b)(a²-ab+b²)3.(x-y)(x²+xy+y²)4(a+b+c)²5.(ax+b)(cx+d)已经知道(2x-a)²=b+4x²-12x,则a=( )b=( )如果x²+ax-6可分解
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![1.已经知道 x+y=3 xy=1,求x²+y²的值2.(a+b)(a²-ab+b²)3.(x-y)(x²+xy+y²)4(a+b+c)²5.(ax+b)(cx+d)已经知道(2x-a)²=b+4x²-12x,则a=( )b=( )如果x²+ax-6可分解](/uploads/image/z/1741665-57-5.jpg?t=1.%E5%B7%B2%E7%BB%8F%E7%9F%A5%E9%81%93+x%2By%3D3+xy%3D1%2C%E6%B1%82x%26sup2%3B%2By%26sup2%3B%E7%9A%84%E5%80%BC2.%EF%BC%88a%2Bb%EF%BC%89%EF%BC%88a%26sup2%3B-ab%2Bb%26sup2%3B%EF%BC%893.%EF%BC%88x-y%EF%BC%89%EF%BC%88x%26sup2%3B%2Bxy%2By%26sup2%3B%EF%BC%894%EF%BC%88a%2Bb%2Bc%EF%BC%89%26sup2%3B5.%EF%BC%88ax%2Bb%EF%BC%89%EF%BC%88cx%2Bd%29%E5%B7%B2%E7%BB%8F%E7%9F%A5%E9%81%93%EF%BC%882x-a%29%26sup2%3B%3Db%2B4x%26sup2%3B-12x%2C%E5%88%99a%3D%EF%BC%88+%EF%BC%89b%3D%EF%BC%88+%EF%BC%89%E5%A6%82%E6%9E%9Cx%26sup2%3B%2Bax-6%E5%8F%AF%E5%88%86%E8%A7%A3)
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