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Anastasiyaarkenova
@Anastasiyaarkenova
July 2022
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10, 12, 14 пожалуйста:)
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m11m
10. А₁=-10
d=2
S₅-?
A₅=A₁+4d₁=-10+4*2=-10+8=-2
S₅=
(-10-2)*5
=-6*5=-30
2
Ответ: D. -30.
12. S₆=9
A₄-A₂=0.4
A₁-?
A₄=A₁+3d
A₂=A₁+d
A₄-A₂=A₁+3d-A₁-d=2d
2d=0.4
d=0.2
S₆= (2A₁+d(6-1))*6 = (2A₁+5d)*3=6A₁+15d=6A₁+15*0.2=6A₁+3
6A₁+3=9
6A₁=9-3
6A₁=6
A₁=1
Ответ: С. 1.
14. d-?
A₁₁=15
A₁=5
A₁₁=A₁+10d
15=5+10d
15-5=10d
10=10d
d=1
Ответ: D. 1.
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Answers & Comments
d=2
S₅-?
A₅=A₁+4d₁=-10+4*2=-10+8=-2
S₅=(-10-2)*5=-6*5=-30
2
Ответ: D. -30.
12. S₆=9
A₄-A₂=0.4
A₁-?
A₄=A₁+3d
A₂=A₁+d
A₄-A₂=A₁+3d-A₁-d=2d
2d=0.4
d=0.2
S₆= (2A₁+d(6-1))*6 = (2A₁+5d)*3=6A₁+15d=6A₁+15*0.2=6A₁+3
6A₁+3=9
6A₁=9-3
6A₁=6
A₁=1
Ответ: С. 1.
14. d-?
A₁₁=15
A₁=5
A₁₁=A₁+10d
15=5+10d
15-5=10d
10=10d
d=1
Ответ: D. 1.