Question

x平方-1大于等于0 答案 加过程..

Answer 1

x²-1≥0
(x+1)(x+1)≥0
x≥1或x≤-1
备注：大于号取两边，小于号取中间

Answer 2

x^2-1>=0
x^2>=1
x<=-1或x>=1

Answer 3

x^2-1≥0
x^2≥1
当x＜0时
x-1
x≥0时
x≥1

Answer 4

x^2-1>=0
x^2>=1
-1>=x或x>=1