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Five Inequalities Required by Senior High School Mathematics
Solution:

x? -x-2 & gt; 0

(x+ 1)(x-2)>0

X<- 1 or x>2

2x? +(5+2k)x+5k & lt; 0

(2x+5)(x+k)& lt; 0

[x-( -5/2)][x-(-k)]0

If the integer solution of the inequality group is only -2.

-5/2 & lt; -k & lt; three

Solution: -3

The value range of k is (-3,5/2).