№1 Разложите на множетили
1. 2с(х-у)+р(x-y);
2.2(x-7)-y(7-x);
3.3c+3c²-a-ac;
4.7a+7c;
5.x²+6x+8;
6.a⁴+c⁴;
№2 Упростите выражение
1(х-2а)²;
2(а-5)(а+5);
3 (2а-в)(2а+в)+в²
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