- 计算(22+42+62+…+1002)-(12+32+52+…+992)1+2+3+…+10+9+…+2+1=______.
- 计算:98766×98768-98765×98769.
- 脱式计算(能简算的要简算).①945+9945+99945+999945+9999945②(19.2+13719)×6.25+(4.08+261219)×614③7.6×2009.5+(2009.5+12...
- 计算.(1)0.036×250+3.6×7.5=______(2)99999×77778+33333×66666=______(3)100+99-98+97-96+95+…+3-2+1=______.
- 333×334+999×222.
- 99.99×55.55÷11.1119.9×19.8-19.7×19.6(1+4+7+…+2008+2011)-(2+5+8+…+2006+2009)0.1÷0.1÷0.1÷…÷0.120个0.1.
- 20082008×2007-20072007×2008=______.
- ①[1-1×(0+1)+1÷1]÷(1000-999)=______②1+2-3-4+5+6-7-8+9+10-…+1990=______.
- 用简便方法计算①100-98+96-94+92-90+…+8-6+4-2②(25+125)×8③(98+98+98+98)×25④785-(217+185)⑤454+999×999+545⑥426+1999.
- 计算:58×138-80÷15+42×137-70÷15=______.
- 用简便方法计算.2003×2003+2004×2004-2003×2004-2002×2003.62.4×4.8÷3.12÷8.103.2+102.8+103.3+102.9+103.1+102.6.27.3÷3...
- 25×32÷14+36÷21×25=
- (1234+2314+3412+4123)÷(1+2+3+4)=______.
- 计算:l+{[(l-0.9)2×10-0.09]×100-0.009}×(2×115÷310-223×3)=______.
- (1.65×2+1.56×3×45-950)×0.3÷0.5.