6-(+3)-(-7)+(-2)等于几

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6-(+3)-(-7)+(-2)等于几6-(+3)-(-7)+(-2)等于几6-(+3)-(-7)+(-2)等于几 

6-(+3)-(-7)+(-2)等于几
6-(+3)-(-7)+(-2)等于几

6-(+3)-(-7)+(-2)等于几