— The box is too heavy to carry. What's in it?
— Jack _______ it with many books.
化简:
(1)(2a+3b)(3a﹣2b)﹣12(3a+2b)2﹣a(32a﹣b);
(2)4-aa÷(a+2a2-2a﹣a-1a2-4a+4