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dardyachenko20
@dardyachenko20
June 2022
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Помогите пожалуйста!!! Срочно!!
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tamarabernukho
A₆-a₄=a₁+5d-a₁-3d=2d=6 ⇒ d=3
(a₁+5d)²+(a₁+3d)²=50
(a₁+15)²+(a₁+9)²=50
a₁²+30a₁+225+a₁²+18a₁+81=50
a₁²+24a₁+128=0
D=24²-4*128=64=8²
a₁=-16 или a₁=-8
a₁₀=-16+3*9=11 a₁₀=-8+3*9=19
S₁₀=(-16+11)*10/2=-25 S₁₀=(-8+19)*5=55
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Answers & Comments
(a₁+5d)²+(a₁+3d)²=50
(a₁+15)²+(a₁+9)²=50
a₁²+30a₁+225+a₁²+18a₁+81=50
a₁²+24a₁+128=0
D=24²-4*128=64=8²
a₁=-16 или a₁=-8
a₁₀=-16+3*9=11 a₁₀=-8+3*9=19
S₁₀=(-16+11)*10/2=-25 S₁₀=(-8+19)*5=55