问题
解答题
(1)(2008-π)0+(
(2)当x=-
|
答案
(1)(2008-π)0+(
)-1-1 3
cos45°2
=1+3-1
=3;
(2)(
-3x x-1
)÷x x+1 x x2-1
=3(x+1)-(x-1)
=2x+4.
当x=-
时,1 3
原式=-
+4=2 3
.10 3
(1)(2008-π)0+(
(2)当x=-
|
(1)(2008-π)0+(
)-1-1 3
cos45°2
=1+3-1
=3;
(2)(
-3x x-1
)÷x x+1 x x2-1
=3(x+1)-(x-1)
=2x+4.
当x=-
时,1 3
原式=-
+4=2 3
.10 3