问题 解答题
计算:
(1)
1
x-1
-
x
x2-1

(2)(1+
1
x
)÷(2x-
1+x2
x
)
答案

(1)原式=

x+1
(x+1)(x-1)
-
x
(x+1)(x-1)

=

x+1-x
(x+1)(x-1)

=

1
x2-1

(2)原式=

x+1
x
÷
2x2-(1+x2)
x

=

x+1
x
x
(x+1)(x-1)

=

1
x-1

单项选择题 A1型题
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