小学数学题,求解!!!1急~~·
计算:(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005+1/2006)-(2+1/2003+1/2004+1/2005+1/2...
计算:(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005+1/2006)-(2+1/2003+1/2004+1/2005+1/2006)*(1/2003+1/2004+1/2005)=???实在是不会啊,希望大家告诉我,详细点哟~我满意的话会加分的哟!!
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(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005+1/2006)-(2+1/2003+1/2004+1/2005+1/2006)*(1/2003+1/2004+1/2005)
=(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005)+(2+1/2003+1/2004+1/2005)*1/2006-(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005)-1/2006*(1/2003+1/2004+1/2005)
=1/2006*2=1/1300
=(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005)+(2+1/2003+1/2004+1/2005)*1/2006-(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005)-1/2006*(1/2003+1/2004+1/2005)
=1/2006*2=1/1300
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