问题
解答题
计算化简: (1)|-4|+(-1)2009-(
(2)(x+1-
|
答案
(1)原式=4-1-4+1…(3分)
=0;…(5分)
(2)原式=(
-x2-1 x-1
)•15 x-1 x-1 x-4
=
•x2-16 x-1
…(3分)x-1 x-4
=
•(x+4)(x-4) x-1
…(4分)x-1 x-4
=x+4.…(5分)
计算化简: (1)|-4|+(-1)2009-(
(2)(x+1-
|
(1)原式=4-1-4+1…(3分)
=0;…(5分)
(2)原式=(
-x2-1 x-1
)•15 x-1 x-1 x-4
=
•x2-16 x-1
…(3分)x-1 x-4
=
•(x+4)(x-4) x-1
…(4分)x-1 x-4
=x+4.…(5分)