问题 解答题
(1)先化简,再求值:(x-
x
x+1
)÷(1+
1
x2-1
),其中x=
2
+1

(2)计算:-32+(-3)-2+(2×106)×(1×10-5)+(π-3)0
答案

(1)原式=

x2
x+1
÷
x2
x2-1
=
x2
x+1
(x+1)(x-1)
x2
=x-1,

将x=

2
+1时,原式=
2
+1-1=
2

(2)原式=-9+

1
9
+2×10+1=12
1
9

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