计算2-5/12-5/18+1/12-7/18-42/17
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![计算2-5/12-5/18+1/12-7/18-42/17](/uploads/image/z/347907-3-7.jpg?t=%E8%AE%A1%E7%AE%972-5%2F12-5%2F18%2B1%2F12-7%2F18-42%2F17)
计算2-5/12-5/18+1/12-7/18-42/17
计算2-5/12-5/18+1/12-7/18-42/17
计算2-5/12-5/18+1/12-7/18-42/17
=2-(5/12-1/12)-(5/18+7/18)-42/17
=2-1/3-2/3-42/17
=1-42/17
=-25/17
=2-(5/12-1/12)-(5/18+7/18)-42/17
=2-1/3-2/3-42/17
=1-42/17
=-25/17