因式分解x^2-xy-1+1/4y^2

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因式分解x^2-xy-1+1/4y^2因式分解x^2-xy-1+1/4y^2因式分解x^2-xy-1+1/4y^2x²-xy+1/4y²-1=(x-1/2y)²-1=(x

因式分解x^2-xy-1+1/4y^2
因式分解x^2-xy-1+1/4y^2

因式分解x^2-xy-1+1/4y^2
x²-xy+1/4y²-1
=(x-1/2y)²-1
=(x-1/2y+1)(x-1/2y-1)

x^2-xy-1+1/4y^2
=x^2-xy+1/4y^2 -1
=(x-1/2y)^2-1
=(x-1/2y +1)(x-1/2y -1)