Sagot :
Bonsoir,
1.
[tex]\boxed{u_0=\dfrac{1}{3}} \\\\u_1=1\\u_2=3\\u_3=9\\q=\dfrac{u_2}{u_1} =\dfrac{3}{1} =3\\[/tex]
2.
[tex]u_n=u_0*q^n=\dfrac{1}{3} *3^n=3^{n-1}[/tex]
Bonsoir,
1.
[tex]\boxed{u_0=\dfrac{1}{3}} \\\\u_1=1\\u_2=3\\u_3=9\\q=\dfrac{u_2}{u_1} =\dfrac{3}{1} =3\\[/tex]
2.
[tex]u_n=u_0*q^n=\dfrac{1}{3} *3^n=3^{n-1}[/tex]