[tex]( \frac{ 7^{-4} ) 5{} } { 7^{-21} } [/tex] 2) 0,39:13/40 помогите пожалуйста). Created by Alexa1918. algebra-ru

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Alexa1918 @Alexa1918

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[tex]( \frac{ 7^{-4} ) 5{} } { 7^{-21} }
[/tex]
2) 0,39:13/40
помогите пожалуйста)

Answers & Comments

nafanya2014

Verified answer

$\frac{(7^{-4})^5}{7^{-21}}= \frac{7^{-4\cdot5}}{7^{-21}}= \frac{7^{-20}}{7^{-21}}= \frac{1}{7^{-1}}=7$
2) (39/100) :(13/40)=(39/100)·(40/13)=(39·40)/(100·13)=(3·4)/10=1,2

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