计算:(1):(m+n+1)^2=16,求(m+n)^4-2(m+n)^2+1 (2):2x-y=1/3,xy=3,求4
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计算:(1):(m+n+1)^2=16,求(m+n)^4-2(m+n)^2+1 (2):2x-y=1/3,xy=3,求4x^3y-4x^2y^2+xy^3 麻烦大虾们,哥哥姐姐,叔叔阿姨,爷爷奶奶,弟弟妹妹~
(1):(m+n+1)^2=16, m+n+1=4或-4 m+n=3或-5 (m+n)^4-2(m+n)^2+1 =(m+n-1)^2 =(3-1)^2=4 或=(-5-1)^2=36 (2):2x-y=1/3,xy=3, 4x^3y-4x^2y^2+xy^3 =xy(4x^2-4xy+y^2) =xy(2x-y)^2 =3*(1/3)^2 =1/3
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