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Dau Coroana

Daca
3a+2b+4c=399 si b+2c=150 ,calculati a si ab+2ac



Răspuns :

3a+2(b+2c)=399
3a+2x150=399
3a=399-300
a=99:3
a=33
ab+2ac=a(b+2c)=33x150=4950
ab+2ac=a(b+2c)
3a+2(b+2c)=399
3a+2x150=399
3a=399-300=99
a=99:3=33
ab+2ac=a(b+2c)=ax150=33x150=4950