- B11+2-3-4+5+6-7-8+9+10-11-12+…+1993+1994-1995-1996+1997+1998.E1
- B116+15-14-13+12+11-10-9+8+7-6-5+4+3-2-1=______.E1
- B110-9.8-9.6-9.4-9.2-…-0.8-0.6-0.4-0.2.E1
- B11-2+3-4+5-6+…+1991-1992+1993=______.E1
- B1计算:21+22+23+24+25+26+27+28+29.E1
- B12006-2005-2004+2003+2002-2001+1999+1998-1997-8+7+6-5-4+3+2-1的计算结果是( )E1B2 A.0 B.1 C.2 D.2001 E2
- B1102-101+100+99-98-97+96+95-94-93+92+91-90-89+…+8+7-6-5+4+3-2-1=______.E1
- B139999+3999+399+39.E1
- B10.8+9.8+99.8+999.8+9999.8.E1
- 103+104+105+106+107+108+109.
- B1计算:1+3+5+7+9+11+13+15+17+19+21+23=______.E1
- B1计算:1+2+3+…+98+99+98+…+3+2+1=______.E1
- 请迅速计算下列算式,并写清主要步骤:2+4+6+8+…+50=
- B1计算:12+102+21+201+202+2012=______.E1
- 计算:24+63+52+17+49+81+74+38+95=______.