问题
解答题
计算: (1)(-1)2004+(-
(2)(2a+3b)(2a-3b)+(a-3b)2 (3)20052-2007×2003. |
答案
(1)原式=1+4-1
=4;
(2)原式=4a2-9b2+a2-6ab+9b2
=5a2-6ab;
(3)原式=20052-(2005+2)
=20052-(20052-4)
=20052-20052+4a
=4.
计算: (1)(-1)2004+(-
(2)(2a+3b)(2a-3b)+(a-3b)2 (3)20052-2007×2003. |
(1)原式=1+4-1
=4;
(2)原式=4a2-9b2+a2-6ab+9b2
=5a2-6ab;
(3)原式=20052-(2005+2)
=20052-(20052-4)
=20052-20052+4a
=4.