方程x2-4=0的解是( )。
x=±2
Tom doesn't tell me when he . I will call you as soon as he _____.[ ]
A. will come, comes
B. will come, will come
C. comes, will come
-3≤x≤3. (1)|x-1|+|x+3|=4; (2)||x-1|-x|=1.