______是0.17的1000倍;0.3缩小______是0.003.
0.17×1000=170,0.3÷100=0.003,
故答案为:170,100倍.
相关系数与回归系数可以是负值,是由于下列哪式可出现负值?()
A.∑(X-X)2
B.∑(Y-Y)2
C.∑XY-(∑X)( ∑Y)/n
D.∑Y2-(∑Y)2/n
E.∑(X-X)2/n
下列程序的执行结果为( )。# include <iostream.h>void main ( ){int a=3,b=0;int * p=&a;b= +a++;cout << * p <<"," << b << endl;}
A.选项卡
B.文本框控件
C.列表框或组合框控件
D.选项组控件