2009+200920080.25+200820090.75-820090.125*2008,简便计算 ,

分类: 作业答案 • 2022-06-02 00:25:01

问题描述：

2009+2009*2008*0.25+2008*2009*0.75-8*2009*0.125*2008,简便计算 ,

答

2009+2009*2008*0.25+2008*2009*0.75-8*2009*0.125*2008
=2009*(1+2008*0.25+2008*0.75-8*0.125*2008)
=2009*(1+2008*(0.25+0.75)-2008)
=2009*1
=2009

2009+2009*2008*0.25+2008*2009*0.75-8*2009*0.125*2008,简便计算 ,