Найти n, если а33=17, аn=-28, d=3. Created by aslan050. algebra-ru

Найти n, если а33=17, аn=-28, d=3...

August 2022 1 3 Report

Найти n, если а33=17, аn=-28, d=3

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армения20171 А33=17;an=-28;d=3

a33=a1+(33-1)d=17
a1+32*3=17
a1=17-96
a1=-79

an=a1+(n-1)d=-28
-79+3(n-1)=-28
3(n-1)=-28+79
3(n-1)=51
n-1=51:3
n-1=17
n=18

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