A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=a,y=-3,且-2A=2a,求A值
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![A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=a,y=-3,且-2A=2a,求A值](/uploads/image/z/2096458-34-8.jpg?t=A%3D2x%26%23178%3B-3xy%2By%26%23178%3B-x%2B2y%2CB%3D4x%26%23178%3B-6xy%2B2y%26%23178%3B%2B3x-y%2C%E8%8B%A5x%3Da%2Cy%3D-3%2C%E4%B8%94-2A%3D2a%2C%E6%B1%82A%E5%80%BC)
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=a,y=-3,且-2A=2a,求A值
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=a,y=-3,且-2A=2a,求A值
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=a,y=-3,且-2A=2a,求A值
18或24.5