Răspuns :

Albatranid

Răspuns:

e irational

Explicație pas cu pas:

x=48*(7^99-1)/(7-1)+1=

8*(7^99-1) +1

8*7^99-8+1

8*7^99-7

7(8*7^98-1) care are ultima cifra UC(7*UC (8*9-1))=7 deci nu e p.p

probabil ai scris ceva gresit

Ionela1018id

Răspuns:

Explicație pas cu pas:

x = 48+1+48(7²+[tex]x= 48+1+48(7^{2} +7^{4} +7^{6} +...+7^{98} )= 49+48(7^{2} +7^{4} +7^{6} +...+7^{98} )=7^{2} +48*7^{2}+48(7^{4} +7^{6} +...+7^{98} )=7^{2} (48+1)+48(7^{4} +7^{6} +...+7^{98} )=7^{2}*49+48(7^{4} +7^{6} +...+7^{98} )=7^{4}+48(7^{4} +7^{6} +...+7^{98} )=...= 7^{96} +48*(7^{96}+7^{98})=7^{96}(1+48) + 48*7^{98}=49*7^{96}+48*7^{98}=7^{2}*7^{96}+48*7^{98}=7^{98}*(1+48)=7^{98}*7^{2}=7^{100}\\\sqrt{x} = \sqrt{7^{100}} = \sqrt{(7^{50})^{2} } = 7^{50}[/tex]

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