(1)(﹣x﹣y)(x﹣y)+(x+y)2; (2)(2a6x3﹣9ax6)÷(3ax3); (3)(2x﹣5)(2x+5)﹣(2x+1)(2x﹣3); (4); (5)﹣23+8﹣1×(﹣1)3×(﹣)﹣2+7°; (6)(2x﹣y+1)(2x+y﹣1); (7); (8)(a+2)(a2+4)(a4+16)(a﹣2); (9)(x﹣y)2(x2+y2)2(x+y)2; (10)(5m3n2)2(﹣2m2)3(﹣n3)4; (11)(π﹣3)0+(﹣0.125)2009×82009; (12)(2am﹣3bn)(3an+5bm); (13)(x+y)(x﹣y)﹣(x﹣y)2; (14)(﹣2a2+3a)﹣(a2﹣2a+1); (15)﹣2a(a2b+a﹣1) (16)[x4y﹣2x2(x2﹣3xy2)]÷(﹣2x3) (17)(2m+n)(3n+1) (18)1012 (19)199×201 (20)20082 (21)782 (22)(a+b+1)(a+b﹣1) (23)(a﹣b)(a+b)(a2+b2) (24)(66x6y3﹣24x4y2+9x2y)÷(﹣3x2y) |