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1x4/1+2x5/1+3x6/1+...+2012x2015/1
题目详情
1x4/1+2x5/1+3x6/1+...+2012x2015/1
▼优质解答
答案和解析
1x4/1+2x5/1+3x6/1+...+2012x2015/1
=(1-4/1+2/1-5/1+3/1-6/1+……+2012/1-2015/1)÷3
=(1+2/1+3/1-2013/1-2014/1-2015/1)÷3
=8169176730/14976817963÷3
=24507530190/14976817963
=(1-4/1+2/1-5/1+3/1-6/1+……+2012/1-2015/1)÷3
=(1+2/1+3/1-2013/1-2014/1-2015/1)÷3
=8169176730/14976817963÷3
=24507530190/14976817963
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