(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）