2012+2011+2010+…+1007-1006-1005-1004-…-1=______.
2012+2011+2010+…+1007-1006-1005-1004-…-1=______.
2012-2011+2010-2009+…+4-3+2-1=______.
计算:1×2+2×4+3×6+…+1005×2010=______.
小数的计数单位是______、______、______….
巧填单位名称.1______-59______=1______;1______-9______=1______;1___
15+22+29+…+2003+2010=______.
2012×2012-2013×2011=______.
2011×20102010-2010×20112011=______.
-1-2-3-4-…-100=______.
1×2+2×3+…+100×101=______.
2.5÷0.4=6…1______.
1+3+5+…+99=______.