639. Преобразуйте в многочлен стандартного вида:
a) 18x²-(10x - 5+18x²);
б)-12с²+5с+(с+11с²)
в) (b²+b — 1) — (b²— b+1);
г) (15 — 7у²) — (у³ — у² - 15).
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