①（x+y）（-x-y）②已知a²+b²-8a-10b+41=0,求5a-b²+25的值.③已知x²y²+x²+y²+1=4xy,求2x+y-1的值.④已知a=1/3x+2006,b=1/3x+2007,c=1/3x+2008,求a²+b²+c²-ab-ac-bc的值.⑤已知x²-4x
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