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问题: 列算式计算

【5/1+6/1】-【5/1-7/1】-【7/1-8/1】
=
=
=

解答:

=5/1 +6/1-5/1 +7/1 -7/1+8/1
=6/1+8/1
=24/4+24/3
=24/7