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chystia01
@chystia01
July 2022
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Найдите сумму первых шести членов арифметической прогрессии если a1= -11, b= 2,5
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Alexаndr
Verified answer
A(1)= -11
d= 2,5
S(6)= (2×(-11)+5×2,5)×6/2= 3(-22+12,5)= 3×(-9,5)= -28,5
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Answers & Comments
Verified answer
A(1)= -11d= 2,5
S(6)= (2×(-11)+5×2,5)×6/2= 3(-22+12,5)= 3×(-9,5)= -28,5