问题
解答题
(1)计算:|-2|-
(2)计算:(1+
|
答案
1)原式=2-
+1 4
-1=2-1=1; 1 4
(2)原式=(
+x-1 x-1
)•1 x-1
=x2-1 x
•x x-1
=x+1.(x+1)(x-1) x
(1)计算:|-2|-
(2)计算:(1+
|
1)原式=2-
+1 4
-1=2-1=1; 1 4
(2)原式=(
+x-1 x-1
)•1 x-1
=x2-1 x
•x x-1
=x+1.(x+1)(x-1) x