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Help me! 1/10*11 + 1/11*12 + 1/12*13 +1/13*14 + 1/14*15

Trebuie sa imi dea 1/30. Cum fac?



Răspuns :

1(10*11+11*11*12*13+13*14+14*15)
1*11(10+12*13+13*14+14*15)
1*11*13(10+12+14+14*15) 
1*11*13(10+12+14+210)
143*246
35178