Răspunsuri

2014-10-13T20:56:25+03:00
 7^{x+7} + x^{x+2} =2450
 7^{x+2} (7⁵+1)=2450
 7^{x+2} ·(7⁵+1)=2·5²·7²
x+2=2   x=0

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