问题
填空题
计算:
(1)3.25×2.74+32.5×0.736-0.325=______;
(2)1+2+3+…+2005=______.
答案
(1)3.25×2.74+32.5×0.736-0.325
=0.325×27.4+0.325×73.6-0.325,
=(27.4+73.6-1)×0.325,
=32.5.
(2)1+2+3+…+2005
=(1+2005)×2005÷2,
=2006×2005÷2,
=2011015.
故答案为:32.5,2011015.