试题:
(1)
3a
7
2
a-3
÷
3a-8
3a15
÷
3
a-3
a-1

(2)(x-1+x+x0)(x-
1
2
-x
1
2

答案:

我来补答
(1)
3a
7
2
a-3
÷
3a-8
3a15
÷
3
a-3
a-1

3a
7
2
a-
3
2
÷
a-
8
3
a
15
3
÷
3a-
3
2
a-
1
2

=
3a2
÷
a
7
3
÷
3a-2

=a
2
3
÷(a
7
3
)
1
2
÷(a-2)
1
3

=a
2
3
÷a
7
6
÷a-
2
3
=a
2
3
-
7
6
÷a-
2
3
=a-
1
2
÷a-
2
3
=a-
1
2
+
2
3
=a
1
6

(2)(x-1+x+x0)(x-
1
2
-x
1
2
)=(x-
1
2
)3-(x
1
2
)3=x-
3
2
-x
3
2
 
 
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