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se dau nr a , b , c care indeplinesc simultan conditiile : a+b=137 , a+ 2b+3c=415. Sa se calculeze b-a

Răspuns :

a+b=137,a=137-b=137-278+3c=-141+3c
a+2b+3c=415
a+b+b+3c=415
137+b+3c=415
b+3c=278,b=278-3c
b-a=278-3c+141-3c=419-6c