14/12-18/20+22/30-26/42+30/56-34/72=72
简算题.14/12-18/20+22/30-26/42+30/56-34/72
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26 72 30 54 27 44 32 25 18 12 42 56
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1/30+1/42+1/56+1/72 简算
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（口算）4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36．
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简算：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