单项式的乘法.(1)5a乘(-2a^2)= (2)-3xy乘2xy^2 (3)3ab^2c乘(-6分之5ab)= (4)2(x-y)乘3(y-x)
问题描述:
单项式的乘法.(1)5a乘(-2a^2)= (2)-3xy乘2xy^2 (3)3ab^2c乘(-6分之5ab)= (4)2(x-y)乘3(y-x)
答
.(1)5a乘(-2a^2)=-10a³
(2)-3xy乘2xy^2=-6x²y³
(3)3ab^2c乘(-6分之5ab)= -2分之5a²b³c
(4)2(x-y)乘3(y-x)=-6(x-y)