(a+1)x²+ax+a>m(x²+x+1)(a+1-m)x²+(a-m)x+(a-m)>0若a+1-m=0a-m=-1则不等式是-x-1>0不是恒成立所以a+1-m不等于0二次函数恒大于0则开口向上且判别式小于0则a+1-m>0a-m>-1(a-m)²-4(a+1-m)(a-m)<0(a-m)²-4(a-m)²-4(a-m)<0(a-m)[3(a-m)+4]<0所以-4/3综上-1
a=2m+X