1.3+2X-X²≥0
X²-2X-3≤0
(X+1)(X-3)≤0
-1≤X≤3
2.X²-X-2≤10
X²-X-12≤0
(X+3)(X-4)≤0
-3≤X≤4;
X²-X-2≥0
(X+1)(X-2)≥0
X≥2或X≤-1
综上-3≤X≤-1或2≤X≤4
1.3+2X-X²≥0
X²-2X-3≤0
(X+1)(X-3)≤0
-1≤X≤3
2.X²-X-2≤10
X²-X-12≤0
(X+3)(X-4)≤0
-3≤X≤4;
X²-X-2≥0
(X+1)(X-2)≥0
X≥2或X≤-1
综上-3≤X≤-1或2≤X≤4