(1)已知m+n=4,则1/2m^2+mn+1/2n^2=

问题描述:

(1)已知m+n=4,则1/2m^2+mn+1/2n^2=
(2)已知x+y=2,xy=-3,则xy^2+x^2y
(3)已知a+b=5,ab=3,求代数式a^3b-2a^2b^2+ab^3
(4)(2008^3-2*2008^2-2006)/(2008^3+2008^2-2009)
(3)(4)要有过程!

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