1.定义域满足
x+2≥0 解得x≥-2
1+√(x+2)≠0 √(x+2)≠-1
定义域为:x≥-2
2.6-5x-x平方≥0 x²+5x-6≤0 (x+6)(x-1)≤0 解得-6≤x≤1
2-x>0 x