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Calculati :
( 3x7⁷ - 20 x 7⁶ -6x7⁵ ) : 49²=


Răspuns :

(3x7^7-20x7^6-6x7^5):49^2=
=(3x7^7-20x7^6-6x7^5):(7^2)^2=
=(3x7^7-20x7^6-6x7^5):7^4=
=7^4:7^4=7^1=7