7/10+5/12-1
【通分】
=7x6/60 +5x5/60 -1
=(42+25)/60 -1
=67/60 -1
=1又7/60 -1
7/60
【通分】
=7x6/60 +5x5/60 -1
=(42+25)/60 -1
=67/60 -1
=1又7/60 -1
7/60
温馨提示：内容为网友见解，仅供参考
第1个回答 2020-06-22
=7x6/60 +5x5/60 -1
=(42+25)/60 -1
=67/60 -1
=1又7/60本回答被网友采纳
=(42+25)/60 -1
=67/60 -1
=1又7/60本回答被网友采纳
第2个回答 2023-03-19
7/10+5/12-1
=42/60+25/60-1
=67/60-1
=7/60
=42/60+25/60-1
=67/60-1
=7/60
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