Вычислите:  1)1/1*2+1/2*3+1/3*4+...+1/99*100=?
2) 2/1*3+2/3*5+2/5*7+...+2/99*100=?
3) 1/10*11+1/11*12+1/12*13+...+1/99*100=?
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