A:沃森
B:施旺
C:达尔文
D:克里克
已知正数x,y,z满足x2+y2+z2=6.
(Ⅰ)求x+2y+z的最大值;
(Ⅱ)若不等式|a+1|﹣2a≥x+2y+z对满足条件的x,y,z恒成立,求实数a的取值范围.
“世纪宝鼎”的“鼎”一共有( )
First, please read the ____ (introduce) of the book. Then tell me your opinion about it.
已知复数z=-12-32i,z_是z的共轭复数,则z_2= ( )