解:(1)原式=52(m3)2(n2)2(﹣2)3(m2)3(n3)4, =25m6n4(﹣8)m6n12, =﹣200m12n16; (2)原式=1+(﹣0.125×8)2009, =1+(﹣1)2009, =1﹣1, =0; (3)原式=(2am)(3an)+(2am)(5bm)﹣(3bn)(3an)﹣(3bn)(5b)m, =6am+n+10ambn﹣9anbn﹣15bm+n; (4)原式=(x)2﹣(y)2﹣[(x)2﹣2(x)(y)+(y)2], =x2﹣y2﹣x2+xy﹣y2, =﹣y2+xy; (5)原式=﹣(66x6y3)×(3x2y)+(24x4y2)×(3x2y)﹣(9x2y)×(3x2y), =﹣22x4y2+8x2y﹣3. |