急、几道数学题、thank.(需要过程、听的懂就行)①(x+y)^2(x-y)^2-(x-y)(x+y)(x^2+y^2)②已知x^2+y^2+2x+4y+5=0,求2008x-2009y的值.③1^2-2^2+3^2-4^2+…-98^2+99^2-100^2+101^2④(2+1)(2^2+1)(2^4+1)…(2^2n+1)⑤(2x-y)^3-(2x-

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