1.条件:(1)k-2不等于0;
x1+x2=(3k+6)/(k-2)<0;
x1*x2=6k/(k-2)>0
解三个桥哗不等式派消羡得:尘拍-2
3.条件:[-(m+13)]^2-4*7*m²-m-2>0;
4>x1+x2 = (m+13)/7>0;
4>x1*x2=m²-m-2/7>0
结果自己解吧!
(1)满足3个条誉弯滑件 1.(K-2)闹拆不等于0
2. (3k+6)的平方-4*(k-2)*6k大于0
3. (3k+6)除以(k-2)小于0
好难庆腊写加QQ358643906
1。两个负根即△=b2-4ac=(3k+6)2-4(k-2)6k>衫锋0
化简后得5K2-28k-12<0 解信渗得或坦晌 -2/5