因式分解4x^2y^2-xy-1
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因式分解4x^2y^2-xy-1因式分解4x^2y^2-xy-1因式分解4x^2y^2-xy-1=2(x-y)^225(x-y)^2-10(x-y)+1=[5(x-y)-1]^2=(5x-5y-1)^
因式分解4x^2y^2-xy-1
因式分解4x^2y^2-xy-1
因式分解4x^2y^2-xy-1
=2(x-y)^2 25(x-y)^2-10(x-y)+1 =[5(x-y)-1]^2 =(5x-5y-1)^2 x-xy^2=x(1+y)(1-y) 169x^2y^2-1=__(13
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