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
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