3. Scoateţi factorul comun:
a) 24x6 - 6x + 12x² - 18x²³
c)-14a²b+28ab²-35a³b²-56d³b³.
e) 72x² - 18x +36x³ - 54x³;
b) 10xy²-15x²y+35x²y²-20xy;
d) 12x³y^2 + 20x²y³2 +28r³y2 - 16r²y³z



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