a) 3x^2(5x^2-4x+3)
b) (-2x^3 - 1/4y - 4xy).8xy^2
c) (4/3y^3 + 2/3y^2 - 1/3).(-3y^2
d) (5x^2-4x).(x-3)
e) (x-3y).(3x^2+4y^2+5xy)
f) (-3x^2+x+1).(x^2+x-5)
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