45+1/8+1/12+1/20+1/30+1/42+1/72+1/90
=45+1/8+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(8*9)+1/(9*10)
=45+1/8+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/8-1/9+1/9-1/10
=45+1/8-1/7+1/8+1/3-1/10
=45+143/420
45+1/8+1/12+1/20+1/30+1/42+1/72+1/90=
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相关问题
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1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
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1/12+1/20+1/30+1/42+1/56+1/72+1/90
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1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
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1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
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2\1-6\1-12\1-20\1-30\1-42\1-56\1-72\1-90\1
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1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=
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2/1＋6/1＋12/1＋20/1＋30/1＋42/1＋56/1＋72/1＋90/1
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1/20+1/30+1/42+1/56+1/72+1/90
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1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
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简算：1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90