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-2 pe 3 totul la puterea 25 * 2 pe 3 totul la puterea 20 : 0,(6) totul la puterea 42 .

Răspuns :

(-2/3)^25 × (2/3)^20 : 0,(6)^42 =

= (-2/3)^25+20 : (6/9)^42 =

= (-2/3)^45 : (2/3)^42 =

= (- 2/3)^45-42 =

= (- 2/3) ^3 =

= - 8/27
(-2/3)^25 • (2/3)^20 : (0,(6))^42=
(-2/3)^(25+20) : (6/9)^42=
(-2/3)^45 : (2/3)^42=
-1• (2/3)^45 : (2/3)^42=
-1• (2/3)^(45-42)=
-1• (2/3)^3=
-1• 8/27=
-8/27