题目内容
化简计算:
(1)1-
÷
(2)
÷(1-
).
(1)1-
a-1 |
a |
a2-1 |
a2+2a |
(2)
x-2 |
x2 |
2 |
x |
(1)原式=1-
•
=1-
=
=-
;
(2)原式=
÷
=
•
=
.
a-1 |
a |
a(a+2) |
(a+1)(a-1) |
=1-
a+2 |
a+1 |
=
a+1-(a+2) |
a+1 |
=-
1 |
a+1 |
(2)原式=
x-2 |
x2 |
x-2 |
x |
=
x-2 |
x2 |
x |
x-2 |
=
1 |
x |
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