Răspunsuri

2014-10-17T00:21:36+03:00
A)  9la puterea 41(9²-9-1)=71·3la puterea x
(3²)la puterea 41·(81-9-1)=71·3la puterea x
71·3la puterea 82=71·3 la puterea x
Notam 71·3 cu t
tla puterea 82=tla puterea x
deci x=82

b)
5la putereax·5²·2 la puterea x·2+7·(2·5)la puterea x=57000
50·(2·5)la puterea x+7·(2·5) la putereax=57000
notam (2·5)la puterea x=t
50t+7t=57000
57t=57000
t=57000/57
t=1000
cum (2·5)la puterea x=t⇒ (2·5)la puterea x=1000
(2·5)la puterea x=(2·5)³
10la puterea x=10³
⇒x=3
verificare
5la puterea 5·2la puterea4+7·10³=57000
3125·16+7000=57000
50000+7000=57000

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