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a) Daca a+b = 20 si b+c = 30, calculati 3a + 7b + 4c
b)Daca a+b=33 si a+c =11,calculati 5a +3b +2c


Răspuns :

a)3a+3b+4b+4c=3x20+4x30=60+120=180
b)3b+3a+2a+2c=3x33+2x11=99+22=121