求解这道题用什么简便方法解?求详细讲解谢谢!急!
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原式
=(1-1/2-1/3-1/4-1/5)[(1/2+1/3+1/4+1/5)+1/6]-[(1-1/2-1/3-1/4-1/5)-1/6](1/2-1/3-1/4-1/5)
=(1-1/2-1/3-1/4-1/5)+1/6(1-1/2-1/3-1/4-1/5)-[(1-1/2-1/3-1/4-1/5)(1/2+1/3+1/4+1/5)-1/6(1/2+1/3+1/4+1/5)]
=1/6(1-1/2-1/3-1/4-1/5)+1/6(1/2+1/3+1/4+1/5)
=1/6
=(1-1/2-1/3-1/4-1/5)[(1/2+1/3+1/4+1/5)+1/6]-[(1-1/2-1/3-1/4-1/5)-1/6](1/2-1/3-1/4-1/5)
=(1-1/2-1/3-1/4-1/5)+1/6(1-1/2-1/3-1/4-1/5)-[(1-1/2-1/3-1/4-1/5)(1/2+1/3+1/4+1/5)-1/6(1/2+1/3+1/4+1/5)]
=1/6(1-1/2-1/3-1/4-1/5)+1/6(1/2+1/3+1/4+1/5)
=1/6
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先算1/2+1/3+1/4+1/5,然后代入算
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