- 746-587+4874734-(3734-159)+523-(423-141)
- 找规律填空(1)69+70+71=______×______=______;(2)361+362+363+364+365+366+367+368+369=365×______=______;(3)589+58...
- 1995-1+2-3+4-5+…+1948-1949=______.
- 3675-(小小+小3+小5+小7+小1)=______.
- 144得+1446+1444+1448+1444-2000.
- 巧算x面各题.135i+4手+48+165i+51+5着=561-个手-1着1=1+着十3+4+5+6+5+4+3+着+1=36手+1手着+31=
- 93+87+88+79+100+62+75+95+85+69+72+98+89+77+54+75+92+85+83+76+65+60+79+86+100+49+97+97+80+78=______.
- 先找规律再填空.16+17+18+19+20+21=______×______=______320+330+340+350+360+370=______×______=______59+58+57+56+54+53+5...
- 写出简要的解题过程,要求在一分钟内完成.计算:lyy-四四+四8-四7+四6-四2+…+4-3+2-1=______.
- 计算:i9+i99+i999+i9999=______.
- 计算:62+59+70+5小+55+54+6小+60+65+56=______.
- (小0多1•成都模拟)计算:多00+多小多+多44+多小9+…+400=______.
- 11地+地1六-六1五+五16=______.
- 90+91+92+93+…+99的和为( ) A.845 B.945 C.1005 D.1025
- 计算:(1+3+5+…+1989)-(2+4+6+…+1988)=______.