1.已知|m-n-2|与(mn-1)²互为相反数,求(-2mn+2m-n)-(3mn-2n-2m)-(m+4n
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1.已知|m-n-2|与(mn-1)²互为相反数,求(-2mn+2m-n)-(3mn-2n-2m)-(m+4n+mn)
2.已知a=2008m+2007,b=2008m+2008,c=2008m+2009,求(a-b)²+(b-c)²+(c-a)²的值.
2.已知a=2008m+2007,b=2008m+2008,c=2008m+2009,求(a-b)²+(b-c)²+(c-a)²的值.
![1.已知|m-n-2|与(mn-1)²互为相反数,求(-2mn+2m-n)-(3mn-2n-2m)-(m+4n](/uploads/image/z/16885642-58-2.jpg?t=1.%E5%B7%B2%E7%9F%A5%EF%BD%9Cm-n-2%EF%BD%9C%E4%B8%8E%EF%BC%88mn-1%29%26sup2%3B%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%82%EF%BC%88-2mn%2B2m-n%29-%283mn-2n-2m%29-%28m%2B4n)
(1)绝对值和平方互为相反数只能两个都是0
所以m-n=2 (1)
mn=1 (2)
(-2mn+2m-n)-(3mn-2n-2m)-(m+4n+mn)=-6mn+3m-3n=6mn+3(m-n)
直接将(1)(2)代入
得到结果为12
(2)a=2008m+2007,b=2008m+2008,c=2008m+2009
a-b=2008m+2007-2008m-2008=-1
b-c=2008m+2008-2008m-2009=-1
c-a=2008m+2009-2008m-2007=2
所以原式=(-1)^2+(-1)^2+2^2=1+1+4=6
所以m-n=2 (1)
mn=1 (2)
(-2mn+2m-n)-(3mn-2n-2m)-(m+4n+mn)=-6mn+3m-3n=6mn+3(m-n)
直接将(1)(2)代入
得到结果为12
(2)a=2008m+2007,b=2008m+2008,c=2008m+2009
a-b=2008m+2007-2008m-2008=-1
b-c=2008m+2008-2008m-2009=-1
c-a=2008m+2009-2008m-2007=2
所以原式=(-1)^2+(-1)^2+2^2=1+1+4=6
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