сократить 1) a²+(3a-в)²= 2)(а-с)(а+с)-(a-2c)²= 3)(3вк²+2/3b⁴к²)²= 4)(3/4а⁵х-1 1/3а⁴х²)² 5)(7-х)²+2а(7-х)+а²=​
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