问题
填空题
计算:(a-2b)2(a+b)=______.
答案
(a-2b)2(a+b)
=(a2-4ab+4b2)(a+b)
=a3+a2b-4a2b-4ab2+4ab2+4b3
=a3-3a2b+4b3.
故答案为:a3-3a2b+4b3.
计算:(a-2b)2(a+b)=______.
(a-2b)2(a+b)
=(a2-4ab+4b2)(a+b)
=a3+a2b-4a2b-4ab2+4ab2+4b3
=a3-3a2b+4b3.
故答案为:a3-3a2b+4b3.