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5 - 9 классы

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12. Упростите. 1)(x-2)²-(x + 2) (x-2) 3) (2x-5y) (2x + 5y)-(2r-Sy)² 5) (5a-7) (5a + 7)-25 (a-2)² 7) (2x + 4) (2x-4)-(2x+5) (2x-5) 9) (a
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