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Efectuatii, va rog.
Dau ciroana.


Efectuatii Va RogDau Ciroana class=

Răspuns :

b)5^21-5^21=0

d)7^56-7^54=7^2

coroana altfel ma supar .


[tex] {5}^{20} \times 5 - {5}^{21} = {5}^{21} - {5}^{21} = 0 \\ \\ ( {7}^{8})^{7} \div {7}^{54} = {7}^{56} \div {7}^{54} = {7}^{2} = 49[/tex]