{an}为等比数列,若a1+a2+a3=26,a4-a1=52,求an

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/27 11:56:36
{an}为等比数列,若a1+a2+a3=26,a4-a1=52,求an
x)N̫}cOy6uӎ:/&j'i'$&ښ<ؔgTO.;rmK40..30ԄIjՃ @%Ov/+55l:yFZqy@Sl @n5j

{an}为等比数列,若a1+a2+a3=26,a4-a1=52,求an
{an}为等比数列,若a1+a2+a3=26,a4-a1=52,求an

{an}为等比数列,若a1+a2+a3=26,a4-a1=52,求an
a1(1+q+q^2)=26...(1)
a1(q^3-1)=52...(2)
(2)除以(1)
q-1=2
q=3
a1=2
an=2*3^(n-1)