Хееееелп Плиииззз
задание 1: разложить на множители
1) 5x^2-45
2) (5k-3)^2-(4k-3)^2
3) 25x^2-9y^2x+5-3y

Задание 3: решите неравенство
(7+x)^3+x(13-x^2)<21x^2+43
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