упростить выражения
1) (x + 2)(x2 – 2x + 4) – x(x - 3)(x + 3) - 42;
2) (x - 3)(x2 + 3x + 9) - x(x2 – 16) + 21;
3) (2x - 1)(4x2 + 2x + 1) - 23 - 4x(2x2 + 3);
4) 16x(4x2 - 5) + 17 - (4x + 1)(16x2 - 4x + 1).​
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