Question

x-1分之x+1大于等于0怎么解

Answer 1

(x+1)/(x-1)≥0等价于(x+1)(x-1)≥0且x≠1
解得x>1或x≤-1

Answer 2

原式化为(x+1)(x-1)>=0,故x2-1>=0,所以解为x<=-1或x>1...

Answer 3

a/b>=0等价于a>=0,b>0或a<=0,b<0;
解得x>=1或x<-1

Answer 4

(x-1)(x+1)>=0 x<=-1或x>1

Answer 5

(x+1)/(x-1)≥0
x≥1 or x≤-1