解下列一元二次不等式:(1)x^2-5x>6 (2)4x^2-4x+1≤0 (3)-x^2+7x>6
问题描述:
解下列一元二次不等式:(1)x^2-5x>6 (2)4x^2-4x+1≤0 (3)-x^2+7x>6
答
(1)x^2-5x>6
x^2-5x-6>0
(x+1)(x-6)>0
x6
(2)4x^2-4x+1≤0
(2x-1)^2≤0
2x-1=0
x=1/2
(3)-x^2+7x>6
x^2-7x+6