
2个回答
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5/7+2/3+2/7
=(5+2)/7+2/3
=7/7+2/3
=1+2/3
=3/3+2/3
=5/3
=(5+2)/7+2/3
=7/7+2/3
=1+2/3
=3/3+2/3
=5/3
追答
5/7+2/3+2/7
=(5+2)/7+2/3
=7/7+2/3
=1+2/3
=3/3+2/3
=5/3
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