>
数学
>
化简:
(
2
3
a
4
b
7
-
1
9
a
2
b
6
)÷(-
1
3
a
b
3
)
2
=______.
人气:446 ℃ 时间:2019-08-26 08:19:57
解答
(
2
3
a
4
b
7
-
1
9
a
2
b
6
)÷(-
1
3
a
b
3
)
2
=
2
3
a
4
b
7
÷
1
9
a
2
b
6
-
1
9
a
2
b
6
÷
1
9
a
2
b
6
,
=6a
2
b-1.
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