1Zadanie: a1=2 a2=4 a32=?, a23=?
2Zadanie: a1=-16 a2=-14 an=2 n=?
1.
a1=2
a2=4
r=a2-a1=4-2=2
an=a1+(n-1)*r
a32=2+31*2=2+62=64
a23=2+22*2=2+44=46
2.
a1=-16
a2=-14
an=2
a2-a1=-14-(-16)=-14+16=2=r
a1+(n-1)*r=an
-16+(n-1)*2=2
-16+2n-2=2
2n=2+2+16
2n=20
n=20/2
n=10
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1.
a1=2
a2=4
r=a2-a1=4-2=2
an=a1+(n-1)*r
a32=2+31*2=2+62=64
a23=2+22*2=2+44=46
2.
a1=-16
a2=-14
an=2
a2-a1=-14-(-16)=-14+16=2=r
a1+(n-1)*r=an
-16+(n-1)*2=2
-16+2n-2=2
2n=2+2+16
2n=20
n=20/2
n=10