先化简,在求值1.x²-(x²+2xy-y²)+5(y²-3xy),其中x=1/17,y=1/3﹙2﹚5xy-[x²+2xy-2y²﹚],其中x=﹣2,y=﹣15xy-[x²+4xy-y²-(x²+2xy-2y²﹚],其中x=﹣2,y=﹣1
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![先化简,在求值1.x²-(x²+2xy-y²)+5(y²-3xy),其中x=1/17,y=1/3﹙2﹚5xy-[x²+2xy-2y²﹚],其中x=﹣2,y=﹣15xy-[x²+4xy-y²-(x²+2xy-2y²﹚],其中x=﹣2,y=﹣1](/uploads/image/z/2565511-7-1.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%9C%A8%E6%B1%82%E5%80%BC1.x%26%23178%3B%EF%BC%8D%EF%BC%88x%26%23178%3B%EF%BC%8B2xy%EF%BC%8Dy%26%23178%3B%29%EF%BC%8B5%28y%26%23178%3B%EF%BC%8D3xy%29%2C%E5%85%B6%E4%B8%ADx%3D1%2F17%2Cy%3D1%2F3%EF%B9%992%EF%B9%9A5xy%EF%BC%8D%5Bx%26%23178%3B%EF%BC%8B2xy%EF%BC%8D2y%26%23178%3B%EF%B9%9A%5D%2C%E5%85%B6%E4%B8%ADx%3D%EF%B9%A32%2Cy%3D%EF%B9%A315xy%EF%BC%8D%5Bx%26%23178%3B%EF%BC%8B4xy%EF%BC%8Dy%26%23178%3B-%EF%BC%88x%26%23178%3B%2B2xy-2y%26%23178%3B%EF%B9%9A%5D%2C%E5%85%B6%E4%B8%ADx%3D%EF%B9%A32%2Cy%3D%EF%B9%A31)
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