ax^2+4x-1>=-2x^2-a(a+2)x^2+4x+(a-1)>=0若a+2=0a=-2则4x-3>=0不是恒成立所以a+2不等于0这是抛物线恒大于等于0则开口向上且判别式小于等于0a+2>0a>-216-4(a+2)(a-1)=4a^2+a-6>=0(a+3)(a-2)>=0a>-2所以a>=2...