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mikalis
@mikalis
August 2022
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найдите первый член и разность арифметической прогрессии
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olgateviasheva
А₁+а₁+9d=12 a₁+4d+(a₁+10d)=-0.2
a₁+7d -(a₁+4d)=4 a₁+3d+(a₁+9d)=2,6
2a₁+9d=12 2a₁+14d=-0,2
3d=4 2a₁+12d=2,6
d=4|3 2d=-0,2-2,6⇒2d=-2,8⇒d=-1,4
2a₁+12=12⇒a₁=0 2a₁+12*(-1,4)=2,6⇒2a₁=2,6+16,8⇒a₁=19,6÷2=9,8
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Answers & Comments
a₁+7d -(a₁+4d)=4 a₁+3d+(a₁+9d)=2,6
2a₁+9d=12 2a₁+14d=-0,2
3d=4 2a₁+12d=2,6
d=4|3 2d=-0,2-2,6⇒2d=-2,8⇒d=-1,4
2a₁+12=12⇒a₁=0 2a₁+12*(-1,4)=2,6⇒2a₁=2,6+16,8⇒a₁=19,6÷2=9,8