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(1/3) ^ x= 81/√3
1/3= 3^ -1 (1/3) ^ x= 3^ -x
81=3^4
√3=3^ 1/2
81/√3=81;√3=3^4 ; 3^ 1/2= 3 ^ (4-1/2)=3^ 7/2
czyli całośc=
3^-x= 3^ 7/2
-x=7/2
x=-7/2
x=-3,5= odpowiedź
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lub tak;
log 1/3 81/√3= log 1/3 81 - log 1/3 √3=-4-(-1/2)=-3,5
bo:
( 1/3) ^x=81
3^-x=3^4
x=-4
..............
(1/3)^x=√3
3^ -x=3^ 1/2
x=-1/2
...............
^ oznacza ,, do potegi ,,