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5a(5a²-0,2)=25a^3-a
0,2a (5a²-0,2) = 1a³ - a
¹₃t²(3 +½t³) = t² + 1/5t⁵
(12x²y + 3xy²):6=2x²y + 0,5xy²
(4y-6x): (-2) = -2y + 3x