2014²-2013²+2012²-2011²+···+2²-1
2014²-2013²+2012²-2011²+···+2²-1
2014²-2013²+2012²-2011²+···+4²-3
计算:2014²-2013²+2012²-2011²+·········4
2012²-2011²+2010²-2009²8······+2²-1
用分解因式方法作2012²-2011²+2010²-2009²+···+2
计算 50²-49²+48²-47²+···+2²-1²
1²+2²+3²+4²+5² +···+n²=?
直接求和:-1²+2²-3²+4²-5²+6²-······
1-2²+3²-4²+5²-6²+······+99²-10
计算(1-1/2²)(1-1/3²)(1-1/4²)×···×(1-1/2013²
1²-2²+3²-4²+5²-6²+····+99²
100²-99²+98²-97²+·····+2²-1²=?