问题 解答题

(-2ab)(3a2-2ab-4b2

答案

(-2ab)(3a2-2ab-4b2

=(-2ab)•(3a2)-(-2ab)•(2ab)-(-2ab)•(4b2

=-6a3b+4a2b2+8ab3

实验题
单项选择题 A1/A2型题