设x∈R,用[x]表示不超过x的最大整数,称函数f(x)=[x]为高斯函数,也叫取整函数.现有下列四个命题:①高斯函数为定义域为R的奇函数;②“[x]”≥“[y]”是“x≥y”的必要不充分条件;③设g(x)=(12)|x|,则函数f(x)=[g(x)]的值域为{0,1};④方程[x+14]=[x?12]的解集是{x|1≤x<5}.其中真命题的序号是______.(写出所有真命题的序号)
1 |
2 |
x+1 |
4 |
x?1 |
2 |
x+1 |
2 |
x+1 |
2 |
x+1 |
4 |
x+1 |
2 |
x+1 |
2 |
x+1 |
4 |
x+1 |
4 |
x+1 |
4 |
x+1 |
4 |
x+1 |
4 |
x+1 |
2 |
x+1 |
2 |
x+1 |
4 |
x+1 |
4 |
x+1 |
4 |
x+1 |
4 |
x+1 |
2 |
x+1 |
2 |
x+1 |
4 |
x+1 |
4 |
x+1 |
4 |
x+1 |
4 |
x+1 |
2 |