问题
解答题
计算下列各题 (1)(2009)0+(
(2)
|
答案
(1)(2009)0+(
)-1-1 3
•cos45°=1+3-2
×2
=4-1=3;2 2
(2)原式=
-4 (x+2)(x-2)
=x+2 (x+2)(x-2)
=4-x-2 (x+2)(x-2)
=-2-x (x+2)(x-2)
.1 x+2
计算下列各题 (1)(2009)0+(
(2)
|
(1)(2009)0+(
)-1-1 3
•cos45°=1+3-2
×2
=4-1=3;2 2
(2)原式=
-4 (x+2)(x-2)
=x+2 (x+2)(x-2)
=4-x-2 (x+2)(x-2)
=-2-x (x+2)(x-2)
.1 x+2