问题 解答题
(1)计算:
16
+15×(-
1
3
)-(-2)2
(2)化简:(
x2
x+1
-
1
x+1
x2
x2-x
答案

(1)

16
+15×(-
1
3
)-(-2)2

=4+(-5)-4…(3分)

=-5;…(5分)

(2)(

x2
x+1
-
1
x+1
)•
x2
x2-x

=

x2-1
x+1
x2
x2-x
…(1分)

=

(x+1)(x-1)
x+1
x2
x(x-1)
…(3分)

=x.…(5分)

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