问题 解答题
计算或化简:
(1)
1
2
-1
-(
3
+1
0-
8
+|-5|-sin30°
(2)
x-1
x
÷(x-
2x-1
x
答案

(1)原式=

2
+1-1-2
2
+5-
1
2

=

9
2
-
2

(2)原式=

x-1
x
÷
x2-2x+1
x

=

x-1
x
x
(x-1)2

=

1
x-1

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