题目内容
计算:
(1)(ab2)2·(-a3b)3·(-5ab);
(2)(-2xy2)2÷
;
(3)(x+5)(x2+25)(x-5);
(4)(-2x+5)2;
(5)(x +2y -3) (x +2y +3) ;
(6)2006×2008 -20072.
(1)(ab2)2·(-a3b)3·(-5ab);
(2)(-2xy2)2÷
(3)(x+5)(x2+25)(x-5);
(4)(-2x+5)2;
(5)(x +2y -3) (x +2y +3) ;
(6)2006×2008 -20072.
解:(l)5a12b8
(2)12xy3
(3)x4 -625
(4)4x2 -20x+25
(5) x2+4xy +4y2-9
(6)原式=(2 007 -1)×(2 007 +1) -2 0072 =2 0072-1-2 0072= -l
(2)12xy3
(3)x4 -625
(4)4x2 -20x+25
(5) x2+4xy +4y2-9
(6)原式=(2 007 -1)×(2 007 +1) -2 0072 =2 0072-1-2 0072= -l
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