化简求值3x[xy-2x(y-2x)]+3y(x²-y²),其中x=-1,y=2
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化简求值3x[xy-2x(y-2x)]+3y(x²-y²),其中x=-1,y=2
![化简求值3x[xy-2x(y-2x)]+3y(x²-y²),其中x=-1,y=2](/uploads/image/z/1559907-27-7.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC3x%5Bxy-2x%28y-2x%29%5D%2B3y%28x%26%23178%3B-y%26%23178%3B%29%2C%E5%85%B6%E4%B8%ADx%3D-1%2Cy%3D2)
3x²(4x-y)+3yx²-3y*y²=3x²*4x-3y*y²
代入x=-1:;y=2,得值:12*(-1)-3*8=-36
代入x=-1:;y=2,得值:12*(-1)-3*8=-36
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