Функцияны зерттеу толық ответ барма

Question

Алгебра: Функцияны зерттеу толық ответ барма

DYUK1s · Accepted Answer

A₁ = 5, аn + 1= an + 3
a₂ = 5 + 3 = 8
d = 3
a₁₂ = 5 + 3(12-1) = 5 + 33 = 38
a₃₄ = 5 + 3(34-1) = 5 + 99 = 104

a₁ = 84, d = -5
a₃₇ = 84 - 5(37-1) = -96
a₆₀ = 84 - 5(60-1) = -211

-67; -60; -53...
а₁ = -67
d = 7
S₅₂ = 2a₁ + d(n-1)*n / 2 = 2*(-67) + 7(52-1)*52 / 2 = -134 + 18564 / 2 = 9215

an = 5n - 4
a₁ = 5*1 - 4 = 1
a₂ = 5*2 - 4 = 6
d = 5
S₁₅₀ = 2a₁ + d(n-1)*n / 2 = 2*1 + 5(150-1)*150 / 2 = 2 + 111750 / 2 = 55876

a₁ = 32, а₆₁ = -58
a₆₁ = 32 + d(61-1) = 32 + 60d
-58 = 32 + 60d
60d = -90
d = -1,5
-36 = 32 - 1,5(n-1)
-36 = 32 -1,5n + 1,5
-36 = 33,5 - 1,5n
-69,5 = 1,5n
n = -69,5/1,5 - не является

8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200, 208, 216, 224, 232, 240, 248, 256, 264, 272, 280, 288, 296, 304, 312, 320, 328, 336, 344.
S = 7568

MOGZ ответил