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a) (7/9+17/6)-(5/6-1/18)= b) (17/24+5/36)-(5/60-1/18)= c) (4 7/9-1 1/2)-(15/16-1/24)= d) (7/9+17/10-1/18)-(13/27-1/18)= e) (13/63+17/45)-(5/36-127)= f) (7/16+17/5-1/40)-(5/8-3/5)=

Răspuns :

(7/9+17/6)-(5/6-1/18)=(14/18+81/18)-(15/18-1/18)=95/18-14/18=81/18=9/2