October 2018 2 19 Report

Wyznacz ciąg arytmetyczny mając dane a6-a4=1, a5+a13=16

a1+(6−1)r−a1+(4−1)r=1

a1+(5−1r)+a1+(13−1)r=16

a1+5r−a1−3r=1

a1+4r+a1+12r=16

r=0,5 2a1+16r=16

2a1+16 x 0,5=16

2a1+8=16

2a1=8

a1=4


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