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[img]ct_2image008[/img]Column A Column BThe value of y if
[img]ct_2image008[/img]Column A Column BThe value of y if
游客
2024-01-12
49
管理
问题
Column A Column B
The value of y if x=-2 The value of y if x=2
选项
A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案
A
解析
本题的正确答案为(A)。考生在解答此题时,可以用x=2和x=-2直接代入题干中给出函数式,求出函数值,再进行判断大小;但更为简单的方法只需判断x的正负号即可,因为y的第一、三项均为x的偶数次幂,所以x=±2代入均相等,第二项是奇次幂,其结果与x的符号相反,x=-2代入第二项时,其值为正,x=2代入第二项时,其值为负,因此x=-2时y的取值大于x=2时y的取值。
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