题目内容
(2an+3bn+1)(3bn+1-2an)=________.
9b2n+2-4a2n
化简下列各式(n是正整数):
(1)(-3x2n+2yn)3÷[(-x3y)2]n;
(2)(3an+4bn+3+2an+3bn+2-12an+2bn+1)÷6a2bn.