问题 解答题
计算:
(1)
x2-2x+1
x2-1
÷
x-1
x2+x

(2)
3
x-4
-
24
x2-16
答案

(1)原式=

(x-1)2
(x+1)(x-1)
÷
x-1
x(x+1)

=

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

=x;                  

(2)原式=

3(x+4)
(x+4)(x-4)
-
24
(x+4)(x-4)

=

3x-12
(x+4)(x-4)

=

3
x+4

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