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August 2022
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Знайдіть а6 арифметичної прогресії якщо а5=17 ; а7=25
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Lesben
A2=a1+d, a3=a2+d=a1+2d, a4=a3+d=a1+3d, a5=.............
a7=a5+2d, 2d=a7-a5, 2d=25-17,. 2d=8, d=4
a6=a5+d, a6=17+4=21
a6=21
=======
a6=(a5+a7)/2=42/2=21
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Answers & Comments
a7=a5+2d, 2d=a7-a5, 2d=25-17,. 2d=8, d=4
a6=a5+d, a6=17+4=21
a6=21
=======
a6=(a5+a7)/2=42/2=21