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DASHAde
@DASHAde
August 2022
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Найти первый член и разность арифметической прогрессии если a7=-5 ;a23=70
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Lesben
A23 = a7 +(23-7).d
70=-5.+16d
16d=75, d=75/16
a7= a1 + 6d,a1=a7-6d,
a1= -5 -6. 75/16= -5 - 3.75/8 = -5 -225/8= -265/8
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DASHAde
Уверен что правильно?
Lesben
a s indexom r = a s indexom s + (r-s) .d
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Answers & Comments
70=-5.+16d
16d=75, d=75/16
a7= a1 + 6d,a1=a7-6d,
a1= -5 -6. 75/16= -5 - 3.75/8 = -5 -225/8= -265/8