原式=-1/60除以(-10/60-9/60+48/60-55/60)=1除以(10+9-48+55)=1/26
-1/60除以(-1/6-3/20+4/5-11/12)
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25*(-0.4)*2013*(-0.1)计算 (-6分支1+20分之3+5分支4-12分之11)*(-60)计算
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1-5/6+7/12-9/20+11/30-13/4
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3*5=4²-1,5*7=6²-1,...,11*13=12²-1,...
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(-60)÷(3/4+5/6-11/15-7/12)=?
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观察:[1/2=11×2=11−12],[1/6=12×3=12−13],[1/12=13×4=13−14],[1/20
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1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,20,30,40,50,60,
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1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,20,30,40,50,60,
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1/(1*2*3*4) + 1/(2*3*4*5) + 1/(3*4*5*6 )+…+ 1/(11*12*13*14)