2+4+6+8+10+12+14+16+18+.92+94+96+98+100=?用简便方法怎么算

问题描述:

2+4+6+8+10+12+14+16+18+.92+94+96+98+100=?用简便方法怎么算

2+4+6+8+10+12+14+16+18+.92+94+96+98+100
=(2+100)*50/2
=102*25
=2550