若a-b=2,a-c=1,(b-c)²的值为什么?
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若a-b=2,a-c=1,(b-c)²的值为什么?
若a-b=2,a-c=1,(b-c)²的值为什么?
若a-b=2,a-c=1,(b-c)²的值为什么?
答案:(b-c)² = 1
因为
b = a-2
c = a-1
(b-c)² = (a-2 - a+1)² = (-1) ² = 1