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