Выполнить умножение, воспользовавшись формулой разности квадратов.
1) (3 + x)(3 – x)(9+ x²);
2) (x²+1)(x+1)(x - 1);
3) (4x² + y²)(2x + y)(2x - y);
4) (3a – 2b)(3a +2b)(9a² +4b²).​
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