求下列函数中自变量的取值范围: (1)y=-2x+1; (2)S=2t/2t+1.

问题描述:

求下列函数中自变量的取值范围:
(1)y=-2x+1;
(2)S=

2t
2t+1

(1)x取全体实数;
(2)根据题意得:2t+1≠0,解得t≠-

1
2