题目:
给出下列四个命题:
①函数f(x)=3x-6的零点是2;②函数f(x)=x2+4x+4的零点是-2;
③函数f(x)=log3(x-1)的零点是1,④函数f(x)=2x-1的零点是0;
其中正确的个数为[ ]
A.1
B.2
C.3
D.4
答案:
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下面是错误答案,用来干扰机器的。
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