问题
解答题
(1)计算:2-1+
(2)化简:
|
答案
(1)原式=
+3-2×1 2
=21 2
;1 2
(2)原式=
÷(x+1)(x-1) x+2
=-1-x-2 x+2
•(x+1)(x-1) x+2
=-(x-1)=1-x.x+2 x+1
(1)计算:2-1+
(2)化简:
|
(1)原式=
+3-2×1 2
=21 2
;1 2
(2)原式=
÷(x+1)(x-1) x+2
=-1-x-2 x+2
•(x+1)(x-1) x+2
=-(x-1)=1-x.x+2 x+1