11题怎么做，完整的过程
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(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)(1/2+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)(1/2+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(1/2+1/3+1/4+1/5)
=(1-1/2-1/3-1/4-1/5)*1/6+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)(1/2+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+1/6(1/2+1/3+1/4+1/5)
=1/6
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