计算:0.2+0.4+…+0.8+0.10+0.12+…+0.98+0.100=______.
计算:0.2+0.4+…+0.8+0.10+0.12+…+0.98+0.100=______.
计算:0.2+0.4+0.6+0.8+0.10+0.12+0.14+…+0.98(数列计算)过程)必采纳!
计算:1+2+3+…+2012+2013+2012+…+3+2+1=______.
计算i+2i2+3i3+…+2000i2000=______.
计算:2000×1999-1999×1998+1998×1997-1997×1996+…+2×1=______.
计算:12-22+32-42+…+992-1002=______.
计算:200-199+198-197+…+4-3+2-1=______.
计算:120-119+118-117+116-115+…+4-3+2-1=______.
计算5+10+15+20+…+90+95+100=______.
计算:1×2+2×4+3×6+…+1005×2010=______.
计算:19492-19502+19512-19522+…+19972-19982+19992=______.
计算:1+3+5+7+9+…+2013=______.