点进来啊啊啊啊啊啊啊啊!(x-二分之一y-1)(x-二分之一y+1)-(二分之一y-1)²
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简化方程:
(x-1/2y-1)(x-1/2y+1)-(1/2y-1)²
=(x²-1/2xy-x)-(1/2xy-1/4y²-1/2y)+(x+1/2y-1)-(1/4y²-1/2y)+(1/2y-1)
=x²-1/2xy-x-1/2xy+1/4y²+1/2y+x+1/2y-1-1/4y²+1/2y+1/2y-1
=x²-x+x-(1/2xy+1/2xy)+1/4y²-1/4y²+1/2y+1/2y+1/2y+1/2y-(1+1)
=x²-xy+2y-2
(x-1/2y-1)(x-1/2y+1)-(1/2y-1)²
=(x²-1/2xy-x)-(1/2xy-1/4y²-1/2y)+(x+1/2y-1)-(1/4y²-1/2y)+(1/2y-1)
=x²-1/2xy-x-1/2xy+1/4y²+1/2y+x+1/2y-1-1/4y²+1/2y+1/2y-1
=x²-x+x-(1/2xy+1/2xy)+1/4y²-1/4y²+1/2y+1/2y+1/2y+1/2y-(1+1)
=x²-xy+2y-2
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