20.09*37-200.9*1.9+2009*0.82怎样简算?
问题描述:
20.09*37-200.9*1.9+2009*0.82怎样简算?
答
20.09*37-200.9*1.9+2009*0.82
=2009*0.37-2009*0.19+2009*0.82
=2009x(0.37-0.19+0.82)
=2009x1
=2009