圆x^2+y^2-4x-4y-10=0与直线,x+y-14=0的最大距离与最小距离的差
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【就一部不懂】如果x、y∈R,且x≠y,比较(x2+y2)2与xy(x+y)2大小作差法 (x2+y2)2-xy(x+y)2 =x^4+y^4+2x^2y^2-x^3y-2x^2y^2-xy^3 =(x-y)(x^3-y^3) =(x-y)^2[(x+y/2)^2+3y^2/4] ∵x≠y (x-y)^2>0,(x+y/2)^2+3y
2x-y=0与x+y=10
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x*x+2x+y*y-4y+5=0 x= y=
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