- 计算:11+12+13+14+15+16.
- (11+13+15+17+19)-(10+12+14+16+18)=( ) A.5 B.4 C.3 D.0
- 712÷[34-(1112-12)]0.65×6.4-6.5×0.64+65×9%[459-(225+0.64)÷3125+56]×4.51-2+3-4+5-6+…+2009-2010+2011110×13+113×16+116×19...
- 2+4+6+8+10+12+14+16+18+20=( ) A.100 B.110 C.112 D.120
- 945+9945+99945+15×3.
- (2+5+8+…+2000)-(1+4+7+…+1999)=______.
- 23457+34572+45723+57234+72345=( )A.3750B.233333C.233331D.2333310
- 100-98+96-94+92-90+…+76-74+72=
- 计算:21.49+52.37-0.4+5.51-11.37-6.6=______.
- 计算:1-2-3+4+5-6-7+8+9-…+2004+2005-2006-2007+4017=______.
- 15+115+1115+11115+…+1111111115=______.
- 1+2+3+4+5+6+7+8+9=______.
- (2004-1)+(2003-2)+(2002-3)+…+(1003-1002)
- 18+198+1998.
- 28+29+30+31+32.