When I studied further in America, I had many great ____ (memory) about their culture.
下面的说法有误的一项是( )
根据这两个图,小芳认为六年级参加艺术活动的同学比五年级的多.你同意她的看法吗?为什么?
观察下列等式: 12=1,12-22=-3, 12-22+32=6,12-22+32-42=-10 ,由以上等式推测出一个一般性的结论:
对于n∈N*,12-22+32-42+..+(-1)n+1n2= ____.