X10 = X1 + 9d = 38 + (-4)*9 = 2
S10= ((38 + 2):2)*10 = 200
125.348 ≈ 125.35
АП: |125.35-125.348|=0.002
ОП: (|125.35-125.348|/|125.35|) * 100% ≈ 0,0016%
(а+в) (а-2в) +(2в-а) (2в+а)=а^2-2ab+ba-2b^2+4b^2-a^2=-ab+2b^2=b(2b-a)
Решение
x² - 4x > 0
x(x - 4) > 0
x(x - 4) = 0
x₁ = 0
x₂ = 4
+ - +
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- ∞ 0 4 +∞
x ∈ (- ∞; 0)∪(4; ∞)