_______.
设定义在R上的奇函数f(x)满足f(x+3)=-f(1-x)，若f(3)=2，则f(2013) = .
在求两个变量x和y的线性回归方程过程中, 计算得="25," ="250," ="145," ="1380," 则该回归方程是 .
计算:= .
若函数定义域为R，则的取值范围是________．
若函数的零点个数为，则______．
_______.
="25," 
="250," 
="145," 
="1380," 则该回归方程是 .
= . 
定义域为R，则
的取值范围是________．
的零点个数为
，则
______．
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