A:while
B:before
C:a
D:whe
对数据作了处理,相关统计量的值如下表:
已知x,y,z∈R,且x+y+z=1,x2+y2+z2=3,则xyz的最大值是____
2015•贵州毕节)-Do you know Lang Lang?
-Of course. He is a famous pianist and he plays the piano_______ .