20/13-(5/7+7/13)的简算

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20/13-(5/7+7/13)的简算

20/13-(5/7+7/13)
=20/13-5/7-7/13
=(20/13-7/13)-5/7
=1-5/7
=2/7

20/13-(5/7+7/13)=20/13-7/13-5/7=1-5/7=2/7

=20/13-5/7-7/13
=13/13-5/7
=2/7

=20/13-5/7-7/13
=20/13-7/13-5/7
=13/13-5/7
=1-5/7
=2/7

20/13-(5/7+7/13)=20/13-5/7-7/13
=20/13-7/13-5/7
=1-5/7=2/7

20/13-7/13-5/7=1-5/7=2/7