20/13-（5/7+7/13）=?列算式!

网友回答

20/13-（5/7+7/13)
=20/13-5/7-7/13
=20/13-7/13-5/7
=1-5/7
=2/7======以下答案可供参考======
供参考答案1:
=20/13-5/7-7/13
=20/13-7/13-5/7
=(20-7)/13-5/7
=1-5/7
=2/7供参考答案2:
=20/13-5/7-7/13
=1-5/7
=2/7