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aflati valorile lui n pentu care avem 4 la puterea n ori 81
plus2la puterea 2n ori 56
minus 2 la puterea 2n ori 56
mai mic sau egal decat 12 la puterea a 4


Răspuns :

4^n×81+2^2n×56-2^2n×56《12^4
2^2n×81+2^2n×56-2^2n×56《12^4
2^2n(81+56-56)《12^4
2^2n×81《12^4
2^2n×3^4《(4×3)^4
2^2n×3^4《4^4×3^4 deci
2^2n《4^4
2^2n《2^8
n=0,1,2,3,4