To simplify the expression (1.5x^2 - x)*3x - x^2(9x - 3), we first distribute the terms inside the parentheses:
= (4.5x^3 - 3x^2) - (9x^3 - 3x^2)= 4.5x^3 - 3x^2 - 9x^3 + 3x^2= (4.5x^3 - 9x^3) + (-3x^2 + 3x^2)= -4.5x^3 + 0= -4.5x^3
Therefore, the simplified expression is -4.5x^3.
To simplify the expression (1.5x^2 - x)*3x - x^2(9x - 3), we first distribute the terms inside the parentheses:
= (4.5x^3 - 3x^2) - (9x^3 - 3x^2)
= 4.5x^3 - 3x^2 - 9x^3 + 3x^2
= (4.5x^3 - 9x^3) + (-3x^2 + 3x^2)
= -4.5x^3 + 0
= -4.5x^3
Therefore, the simplified expression is -4.5x^3.