(1) 14-4X^2 ≥X(2) X(X+2)
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(1)14-4X^2≥X(2)X(X+2)(1)14-4X^2≥X(2)X(X+2)(1)14-4X^2≥X(2)X(X+2)(1)14-4X^2≥X4x^2+x-14≤0(x+2)(4x-7)≤0-
(1) 14-4X^2 ≥X(2) X(X+2)
(1) 14-4X^2 ≥X
(2) X(X+2)
(1) 14-4X^2 ≥X(2) X(X+2)
(1) 14-4X^2 ≥X
4x^2+x-14≤0
(x+2)(4x-7)≤0
-2≤x≤7/4
(2) X(X+2)
-x<1
x>1
(3) (5-X)(X+4)<0
-4
-2/3
楼上的几年级毕业的，这样的2,3题都可以错？？？
1，-2≤x≦7/4
2，-1/2＜x＜1
3，x＜-4或x＞5
4，-2/3＜X＜1/2
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