已知A=2x²-5xy+2y²+x-2y,B=x²-5/2xy+y²-2x+y,且A-2B=3a,|x-a|+(y-1)²=0
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![已知A=2x²-5xy+2y²+x-2y,B=x²-5/2xy+y²-2x+y,且A-2B=3a,|x-a|+(y-1)²=0](/uploads/image/z/1805776-16-6.jpg?t=%E5%B7%B2%E7%9F%A5A%3D2x%26sup2%3B-5xy%2B2y%26sup2%3B%2Bx-2y%2CB%3Dx%26sup2%3B-5%2F2xy%2By%26sup2%3B-2x%2By%2C%E4%B8%94A-2B%3D3a%2C%7Cx-a%7C%2B%28y-1%29%26sup2%3B%3D0)
已知A=2x²-5xy+2y²+x-2y,B=x²-5/2xy+y²-2x+y,且A-2B=3a,|x-a|+(y-1)²=0
已知A=2x²-5xy+2y²+x-2y,B=x²-5/2xy+y²-2x+y,且A-2B=3a,|x-a|+(y-1)²=0
已知A=2x²-5xy+2y²+x-2y,B=x²-5/2xy+y²-2x+y,且A-2B=3a,|x-a|+(y-1)²=0
A-2B
=2x²-5xy+2y²+x-2y-2x²+5xy-2y²+4x-2y
=5x-4y=3a
|x-a|+(y-1)²=0
所以x-a=0,y-1=0
x=a,y=1
代入5x-4y=3a
5a-4=3a
a=2
x=2,y=1