Question

1. 下列命题中正确的是 （ ） A. 若 a > |b|, 则 a² > b²

1. 下列命题中正确的是 （ ）
A. 若 a > |b|, 则 a² > b²
B. 若 a > b , 则 a² > b²
C. 若 a > b , 则 1/a < 1/b
D. 若 a² > b², 则 a > b

2. 已知 f(x) + 2f(1/x) = 3x, 则 f(x)的解析式为 ( )

A. f(x) = 2/x - x ( x ∈ R )
B. f(x) = 2/x - x ( x ≠ 0 )
C. f(x) = x - 2/x ( x ≠ 0 )
D. f(x) = x - 2/x ( x ∈ R )

3. 已知函数f(x) = x^5 + x^3 + ax + 8 , 且 f(5)=10 , 那么 f(-5) = ( )
A, 26 B, 18 C, 10 D, 6

解不等式
（1）2x^2 > 9x - 7 (2) 2 < |3x-2| < 3

Answer 1

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Answer 2

(1)a
（2）B，用1/x代入，乘以2减原式，但X<>0
(3)D 根据f(x) = f(x) = x^5 + x^3 + ax + 8 =10 得到 x^5 + x^3 + ax=2 ，f(-x)=-[ x^5 + x^3 + ax ]+8=-2+8=6

Answer 3

A B D
(-∞,1/2)∪（7,∞）
(-1/3,00∪(4/3,5/3)
需要解释么

追问

第2，3 题
请解释一下

Answer 4

1.A 2.B 3.A
(1)设y=2x^2-9x+7,y大于0
2x^2-9x+7=0,x=1或x=7/2
所以x大于7/2或x小于1
(2)0小于x小于-1/3或4/3小于x小于5/3

Answer 5

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