6＝2*3 12＝3*4
所以1/6＝1/2+1/3 1/12=1/3+1/4
照此下去可得答案2/5
简算：1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
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相关问题
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简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
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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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一道六年级分数简算题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?写出简算过程
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1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=1怎么算简便?
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简算：1/6+1/12+1/20+1/30+.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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1/12+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=