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Operatorcell2
@Operatorcell2
July 2022
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Дана арифметическая прогрессия (аn). Вычислите а3 если а1 = 20, d = - 4
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Аnonіmus
а3 = а1 × 2d
а3 = 20 + (-4)×2 = 20 - 8
а3 = 12
0 votes
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dinozavr22
А3=а2+d
A2=a1+d
A2=20+(-4)=16
A3=16+(-4)=12
Ответ: а3=12
1 votes
Thanks 0
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Answers & Comments
а3 = а1 × 2d
а3 = 20 + (-4)×2 = 20 - 8
а3 = 12
A2=a1+d
A2=20+(-4)=16
A3=16+(-4)=12
Ответ: а3=12