设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|x-2a|+(y+3)²=0,且-2A+B=a,求A
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![设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|x-2a|+(y+3)²=0,且-2A+B=a,求A](/uploads/image/z/1669918-22-8.jpg?t=%E8%AE%BEA%3D2X%26%23178%3B-3xy%2By%26%23178%3B-x%2B2y%2CB%3D4x%26%23178%3B-6xy%2B2y%26%23178%3B-3x-y%2C%E8%8B%A5%7Cx-2a%7C%2B%28y%2B3%29%26%23178%3B%3D0%2C%E4%B8%94-2A%2BB%3Da%2C%E6%B1%82A)
设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|x-2a|+(y+3)²=0,且-2A+B=a,求A
设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|x-2a|+(y+3)²=0,且-2A+B=a,求A
设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|x-2a|+(y+3)²=0,且-2A+B=a,求A
由|x-2a|+(y+3)²=0可得x=2a,y=-3
带入A,B可得A=8a²+16a+3,B=16a²+30a+21
带入-2A+B=a得a=5,A=283