1.x²-3x-18≤0 2.-x²+x≥3x+1还有（2x+1）分之（2x²-x+1）＞0解不等式

1.x²-3x-18≤0 2.-x²+x≥3x+1
还有（2x+1）分之（2x²-x+1）＞0
解不等式

x²-3x-18≤0
(x-6)(x+3)≤0
-3≤x≤6
-x²+x≥3x+1
x²+2x+1≤0
(x+1)²≤0
x=-1