4150÷1625 20.05×39+200.5×4.1+4.4×10.005 (2005+2006+2007+2008+2009+2010+2011)÷2008 简便运算

问题描述:

4150÷1625 20.05×39+200.5×4.1+4.4×10.005 (2005+2006+2007+2008+2009+2010+2011)÷2008 简便运算

4150÷1625
=4150×4÷(1625×4)
=16600÷6500
=166/65
20.05×39+200.5×4.1+4.4×10.005
=20×39+200×4.1+4.4×10+0.05×39+0.5×4.1+4.4×0.005
=780+820+44+1.95+2.05+0.022
=1644+4.022
=1648.022
(2005+2006+2007+2008+2009+2010+2011)÷2008
=2008×7÷2008
=7