1.先化简再求值(½ x²y+1/5 xy²-¼xy)·(-½xy²),其中x=-2 y=-½[3xy(1-x)-6xy﹙x-½)]·2x·(-xy)²,其中x=﹣1 y=23xy²(-1/3x²y+4x²y²)-4x²y(﹣¾xy²
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![1.先化简再求值(½ x²y+1/5 xy²-¼xy)·(-½xy²),其中x=-2 y=-½[3xy(1-x)-6xy﹙x-½)]·2x·(-xy)²,其中x=﹣1 y=23xy²(-1/3x²y+4x²y²)-4x²y(﹣¾xy²](/uploads/image/z/1031202-18-2.jpg?t=1.%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%88%26%23189%3B+x%26%23178%3By%EF%BC%8B1%EF%BC%8F5+xy%26%23178%3B%EF%BC%8D%26%23188%3Bxy%29%C2%B7%28-%26%23189%3Bxy%26%23178%3B%29%2C%E5%85%B6%E4%B8%ADx%3D-2+y%3D-%26%23189%3B%5B3xy%281%EF%BC%8Dx%29%EF%BC%8D6xy%EF%B9%99x%EF%BC%8D%26%23189%3B%29%5D%C2%B72x%C2%B7%28%EF%BC%8Dxy%29%26%23178%3B%2C%E5%85%B6%E4%B8%ADx%3D%EF%B9%A31+y%3D23xy%26%23178%3B%28%EF%BC%8D1%EF%BC%8F3x%26%23178%3By%EF%BC%8B4x%26%23178%3By%26%23178%3B%29%EF%BC%8D4x%26%23178%3By%28%EF%B9%A3%26%23190%3Bxy%26%23178%3B)
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