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Help ex 39 plssssssss​

Help Ex 39 Plssssssss class=

Răspuns :

5^n+2+3×5^n+1-5n=975

5^n×5²+3×5^n×5-5^n=975

5^n×25+3×5^n×5-5^n=975

5^n×(25+3×5-1)=975

5^n×(25+15-1)=975

5^n×39=975

5^n=975:39

5^n=25

n=2 deoarece 5²=25

bafta! :)