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(-3/10)+(+4/15)+(-7/30)+(+1/12)

Răspuns :

(-3/10)+(+4/15)+(-7/30)+(+1/12)=  -3/10+ 4/15 -7/30+1/12=

= -18/60+16/60 - 14/60 +5/60= - 11/60