已知a,b,c是三个有理数,且a≠b≠c,则满足(a-√3)²=(b-√3)(c-√3)的a,b,c的值共有( ) A.0组 B.1组 C.2组 D.3组
人气:331 ℃ 时间:2019-10-23 14:45:01
解答
(a-√3)²=(b-√3)(c-√3)a²-2a√3+3=bc-(b+c)√3+3a²+3-2a√3=bc+3-(b+c)√3a²+3=bc+3a²=bc2a=b+cbc=[(b+c)/2]²4bc=(b+c)²b²-2bc+c²=0(b-c)²=0b=c和a≠b≠...佩服佩服
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