解答:解:(1)原式=52?(m3)2?(n2)2?(-2)3?(m2)3?(n3)4, =25?m6?n4?(-8)?m6?n12, =-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. 点评:本题考查了整式混合运算,要注意运算顺序,同时要注意:运算结果如有同类项要合并,从而得出最简结果. 注意第二题要运用简便运算. |