<span>(x+10)²=(2-x)²
x^2+20x+100=4-4x+x^2
x^2+20x+100-4+4x-x^2=0
24x=-96
x=-4</span>
Решение
<span>b1= - 64 i q = -1/2.
Sn = [b</span>₁(1 - q^n)] / (1 - q)
bn = b₁ * q^(n - 1)
b₆ = (- 64) * (- 1/2)⁵ = 64/32 = 2
S₅ = [(- 64) * (1 - (-1/2)⁶] / [1 - (- 1/2)] = [- 64*(1 - 1/64)] / (1 + 1/2) =
= [- 64 * (63/64)] / (3/2) = (- 63 * 2) / 3 = - 21 * 2 = - 42
См. файл
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2-3х=5х-2х-16
2-3х=3х-16
-3х-3х=-16-2
-6х=-18
6х=18
х=3