2018-06-07
展开全部
4又7/9-(5/9+4/7)
=4又7/9-5/9-4/7
=4又2/9-4/7
=3又41/63
-----------------------------------------------------------------------------------------
=4又7/9-5/9-4/7
=4又2/9-4/7
=3又41/63
-----------------------------------------------------------------------------------------
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