(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)=

(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