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1).Simplificati fractiile:
a).5(^n+2)•7^n+5^n•7(^n+1)/5(^n+1)•7(^n+1)+7^n•5(^n+);
b).5^n+5 (^n+1)+5 (^n+2)+5 (^n+3)/5 (^n+1)+5(^n+3). PLEASE HELP MEE!!! cine da un raspuns corect dau COROANĂ. Si 50 pnct.