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(3^21+3^20+3^19):3^18=

Răspuns :

(3²¹+3²⁰+3¹⁹):3¹⁸=
3¹⁹(3²+3¹+1):3¹⁸=
3¹⁹:3¹⁸x(9+3+1)=3x13=39
=3^3+3^2+3=39
sper ca te-am ajutat