(5a的2次方b-3ab-1)(-3a的2次方)=
问题描述:
(5a的2次方b-3ab-1)(-3a的2次方)=
答
(5a的2次方b-3ab-1)(-3a的2次方)
=-15a的4次方b+9a的3次方b+3a的2次方