(x-1/2y)²=(x+1/2y)²+?

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(x-1/2y)²=(x+1/2y)²+?(x-1/2y)²=(x+1/2y)²+?(x-1/2y)²=(x+1/2y)²+?(x-1/2y

(x-1/2y)²=(x+1/2y)²+?
(x-1/2y)²=(x+1/2y)²+?

(x-1/2y)²=(x+1/2y)²+?
(x-1/2y)² - (x+1/2y)² = -2x/y
所以?= -2x/y

(x-1/2y)²=(x+1/2y)²+(-2xy)