Calculation: 12 + (13 + 23) + (34 + 24 + 14) + (45 + 35 + 25 + 15) + +（1920+1820+… +120）=______ ．

12+（13+23）+（34+24+14）+（45+35+25+15）+… +（1920+1820+… +120），=12+1+112+2+… +912，=12+22+32+… +192，=（1+2+… +19) So the answer is: 95

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