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1)Daca a=55 si b+c=120 calculati 4a+2b+2c. Rapid pls.

Răspuns :

b.60
ca. 60
4*55+2*60+2*60=220+120+120=460
pe 4a+2b+2c il scriem:

(4x55)+2(b+c)=220+2x120=220+240=460