一元二次不等式训练题求解啊,急! x^2+7x+10小于0x(x+1)大于2(x+1) x^2-4x-12小于0 6x^2+x-1小于等于0 4x^2-4x+1小于等于0

x^2+7x+10(x+2)(x+5)-5x(x+1)>2(x+1)
(x+1)(x-2)>0
x2
x^2-4x-12(x+2)(x-6)-26x^2+x-1≤0
(2x+1)(3x-1)≤0
-1/2≤x≤1/3
4x^2-4x+1≤0
(2x-1)^2≤0
x=1/2

大于负五小于负二

x^2+7x+10小于0
(x+2)(x+5)0
(x-2)(x+1)>0
x2
x^2-4x-12