已知(a-b)²=3,ab=-1/2,求(a+b)²的值
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已知(a-b)²=3,ab=-1/2,求(a+b)²的值已知(a-b)²=3,ab=-1/2,求(a+b)²的值已知(a-b)²=3,ab=-1/2,
已知(a-b)²=3,ab=-1/2,求(a+b)²的值
已知(a-b)²=3,ab=-1/2,求(a+b)²的值
已知(a-b)²=3,ab=-1/2,求(a+b)²的值
(a+b)²
=(a-b)²+4ab
=3+4×(-1/2)
=3-2
=1