17/24—(4/5—7/24)
=17/24-4/5+7/24
=1-4/5
=1/5那个24/17-4/5简变了吗？先去括号，括号前面是-号，括号内的各项都变号。（17/24+7/24）-4/5这一步我省略了。希望能帮到你！！
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