Toán Lớp 6: Tìm x thuộc Z, biết:
5 . 3 mũ x – 3 mũ x = 36
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Toán Lớp 6: Tìm x thuộc Z, biết:
5 . 3 mũ x – 3 mũ x = 36
Comments ( 2 )
5.3^x-3^x=36
->3^x(5-1)=36
->3^{x}.4=36
->3^x=36:4
->3^x=9
->3^x=3^2
->x=2
Vậy x=2
Ron
$5.3^x-3^x=36$
$4.3^x=36$
$3^x=36:4$
$3^x=9$
$3^x=3^2$
$=>x=2$
$Vậy$ $x=2$
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