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1/ 3 x 7 la a 2 + 1/ 3 la a 2 x 7 + 1/ 3 la a 2 x 7 la a 2

Răspuns :

1/3×7la a2=14/3=4intreg si 2/3+1/3 la a 2=30/6×7=210/6+1/3 la 2=212/6×7la 2=2968/36