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6. Calculează: a) (r³-21²-1) : r; b) (1226 + 1824-6x³): (62³): c) (4ry³ - 2r²y - 4ry): (2ry): d) (3ry³ - 6ry² - 3y²) : (3y²); e) (14r³y² - 7z³y) : (7z³y); f) (2xyz + 4x²z - 60:²) : (21²). Va rog urgent ​

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