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-11 supra lui 12+ 11 ssupra lui 20=

Răspuns :

-11/12 = -55/60
11/20 = 33/60

-55/60+33/60=-22/60=-11/30
[tex] \frac{-11}{12} + \frac{11}{20} = \frac{-220+132}{240} = \frac{-88}{240}simplificam cu 8= \frac{-11}{30} [/tex]