题目内容
化简：(
a4b7-
a2b6)÷(-
ab3)2=______．
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(
a4b7-
a2b6)÷(-
ab3)2
=
a4b7÷
a2b6-
a2b6÷
a2b6，
=6a2b-1．
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=
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=6a2b-1．
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