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39-Troba amb la calculadora:<br />

log7123=<br />

log1/277=<br />

log30,039=<br />

log510 23 =<br />

40-Troba sense fer servir la calculadora:<br />

log5625=<br />

log0,001=<br />

ln <br />

√ =<br />

log20,25=<br />

41-Calcula el valor de x en cada una d’‛aquestes expressions:<br />

log7x=-2<br />

logx16=2<br />

log5 x =12<br />

3 x =173<br />

42-Expressa amb un sol logaritme l’‛expressió:<br />

43-Calcula:<br />

ln b + 2ln c – ln d<br />

log264 + log2(1/4) – log39 - log2√2 =<br />

log2(1/32) + log3(1/27) – log21 =<br />

44-Calcula la base d’‛aquests logaritmes:<br />

logx125=3<br />

logx(1/9)=-2<br />

45-Calcula el valor de x en aquestes igualtats:<br />

log3 x =2<br />

7 x =115<br />

logx 2 =-2<br />

5 -x =3

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