(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)
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