已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值. 求答案已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值.求答案,要式子.
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![已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值. 求答案已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值.求答案,要式子.](/uploads/image/z/2733166-46-6.jpg?t=%E5%B7%B2%E7%9F%A5x%26%23178%3B-xy%3D21%2Cxy-y%26%23178%3B%3D-12%2C%E5%88%86%E5%88%AB%E6%B1%82%E5%BC%8F%E5%AD%90x%26%23178%3B-y%26%23178%3B%E4%B8%8Ex%26%23178%3B-2xy%2By%26%23178%3B%E7%9A%84%E5%80%BC.+%E6%B1%82%E7%AD%94%E6%A1%88%E5%B7%B2%E7%9F%A5x%26%23178%3B-xy%3D21%2Cxy-y%26%23178%3B%3D-12%2C%E5%88%86%E5%88%AB%E6%B1%82%E5%BC%8F%E5%AD%90x%26%23178%3B-y%26%23178%3B%E4%B8%8Ex%26%23178%3B-2xy%2By%26%23178%3B%E7%9A%84%E5%80%BC.%E6%B1%82%E7%AD%94%E6%A1%88%2C%E8%A6%81%E5%BC%8F%E5%AD%90.)
已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值. 求答案已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值.求答案,要式子.
已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值. 求答案
已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值.
求答案,要式子.
已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值. 求答案已知x²-xy=21,xy-y²=-12,分别求式子x²-y²与x²-2xy+y²的值.求答案,要式子.