3x²-12=0
x²-4=0
(x+2)(x-2)=0
x1=-2,x2=2
∵分母x-2≠0
∴x≠2
∴当x等于(-2)时,函数3x²-12 /x-2的值为零也就是说,当分子为零,分母不为零时。函数值为零?当分子为零,分母不为零时,分式的值为零
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