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llllliiiiiza
@llllliiiiiza
August 2022
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Люююдиииии срочно помогите!!!!!!!!!!!!
найдите знаменатель геометрической прогрессии если b5=-4\9 b7=-4
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Lyalu
Нужно использовать характеристическое св-во геометр. прогрессии
b6^2=bn+1 ^2 x bn-1 ^2
b6^2= b5 ^2 x b7 ^2
b6 ^2 = (-4/9)^2 x (-4)^2
b6^2= 16/81 x 16
b6^2=16x16/81
b6= 16/9
знаменатель q= -4 : 16/9
q= -4 x 9/16
q= -1 x 9/4
q= - 9/4
2 votes
Thanks 4
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Answers & Comments
b6^2=bn+1 ^2 x bn-1 ^2
b6^2= b5 ^2 x b7 ^2
b6 ^2 = (-4/9)^2 x (-4)^2
b6^2= 16/81 x 16
b6^2=16x16/81
b6= 16/9
знаменатель q= -4 : 16/9
q= -4 x 9/16
q= -1 x 9/4
q= - 9/4