问题 解答题
计算:
(1)(-
1
2
)-1-3tan30°+(1-
2
)0+
12

(2)1-
a-1
a
÷(
a
a+2
-
1
a2+2a
)
答案

(1)原式=-2-

3
+1+2
3

=-1+

3

(2)原式=1-

a-1
a
÷
(a+1)(a-1)
a(a+2)

=1-

a-1
a
×
a(a+2)
(a+1)(a-1)

=1-

a+2
a+1

=

a+1-a-2
a+1

=

-1
a+1

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