[tex]a) \ 2a^{2}\cdot3ab = 6a^{3}b\\\\b) \ -5ab^{2}\cdot6ab = -30a^{2}b^{3}\\\\c) \ 4a^{2}\cdot(-2)ab = -8a^{3}b\\\\d) \ -5ab\cdot a^{2}b\cdot(-4b) = 20a^{3}b^{2}\\\\e) \ -3ab\cdot2c\cdot a=-6a^{2}bc\\\\f) \ -5a^{2}\cdot4abc\cdot(-2)bc = 10a^{3}b^{2}c^{2}[/tex]
