A:The food that tastes good.
B:The food that looks nice.
C:The food that is healthy.
在等差数列an中,已知a4+a8=16,则该数列前11项和S11=( )
下面注音有错误的一项是( )
There ____ ____ ____ swing.
函数f(x)的定义域D={x|x≠0},且满足对于任意x1,x2∈D,有f(x1•x2)=f(x1)+f(x2).
(1)求f(1)与f(﹣1)的值;
(2)判断函数的奇偶性并证明.
①红花×红花→红花 ②红花×红花→红花(301株)+白花(110株)
③红花×白花→红花 ④红花×白花→红花(98株)+白花(107株)