\[1,5x\left( 3x^{2} - 5 \right)\left( 2x^{2} + 3 \right) =\]
\[= 1,5x\left( 6x^{4} - 10x^{2} + 9x^{2} - 15 \right) =\]
\[= 9x^{5} - \ 15x^{3} + 13,5x^{3} - 22,5x =\]
\[= 9x^{5} - 1,5x^{3} - \ 22,5x\]