计算1-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90-1/110 要简便方法 过程详细 急啊
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1-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90-1/110
=1-(1/2-1/3)-(1/3-1/4)-(1/4-1/5)-(1/5-1/6)-(1/6-1/7)-(1/7-1/8)-(1/8-1/9)-(1/9-1/10)-(1/10-1/11)
=1-1/2+1/3-1/3+1/4-1/4.。。。+1/10-1/10+1/11
=1+1/11
=12/11
=1-(1/2-1/3)-(1/3-1/4)-(1/4-1/5)-(1/5-1/6)-(1/6-1/7)-(1/7-1/8)-(1/8-1/9)-(1/9-1/10)-(1/10-1/11)
=1-1/2+1/3-1/3+1/4-1/4.。。。+1/10-1/10+1/11
=1+1/11
=12/11
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1-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90-1/110
=1-(1/2-1/3)-(1/3-1/4)-……-(1/10-1/11)
=1-1/2+1/3-1/3+1/4-……-1/10+1/11
=1/2+1/11
=13/22
=1-(1/2-1/3)-(1/3-1/4)-……-(1/10-1/11)
=1-1/2+1/3-1/3+1/4-……-1/10+1/11
=1/2+1/11
=13/22
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1-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90-1/110
=1-(1/2-1/3)-(1/3-1/4)-……-(1/10-1/11)
=1-1/2+1/3-1/3+1/4-……-1/10+1/11
=1/2+1/11
=13/22
=1-(1/2-1/3)-(1/3-1/4)-……-(1/10-1/11)
=1-1/2+1/3-1/3+1/4-……-1/10+1/11
=1/2+1/11
=13/22
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1-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90-1/110
=1-(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110)
=1-(1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-
1/10+1/10-1/11)
=1-(1/2-1/11)
=1-1/2+1/11
=1/2+1/11
=13/22
=1-(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110)
=1-(1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-
1/10+1/10-1/11)
=1-(1/2-1/11)
=1-1/2+1/11
=1/2+1/11
=13/22
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