Question

Решите плиз вопрос 3 и 4 срочно

Answer 1

9х²+8≥18х
9х²-18х+8 ≥ 0
9х²-18х+8 = 0
D = 324 -4*8*9=36=6²
х₁=12/18=$frac{2}{3}$    х₂=$1 frac{1}{3}$
__+__|2/3|__-__|1+1/3|__+__
x ∈ (-∞;2/3]∪[1 1/3;+∞)

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25 - 10x + x² > 0
   x = 5
х ∈ (-∞; 5)∪(5;+∞)