问题
解答题
(-2ab)(3a2-2ab-4b2)
答案
(-2ab)(3a2-2ab-4b2)
=(-2ab)•(3a2)-(-2ab)•(2ab)-(-2ab)•(4b2)
=-6a3b+4a2b2+8ab3.
(-2ab)(3a2-2ab-4b2)
(-2ab)(3a2-2ab-4b2)
=(-2ab)•(3a2)-(-2ab)•(2ab)-(-2ab)•(4b2)
=-6a3b+4a2b2+8ab3.