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x² -2√3x +3 - 2(x²-3)+ x²+2√3x +3= 2x² + 6 -2x²+6=12
Zad 2
4a²-12a+9 - (4a²+12a+9)= 4a² -12a + 9 - 4a² - 12a -9=-24a