(5/12-3/7)-(4/7-7/12)简便计算

题目详情

▼优质解答

答案和解析

(5/12-3/7)-(4/7-7/12)
=5/12-3/7-4/7+7/12
=5/12+7/12-3/7-4/7
=(5/12+7/12)-(3/7+4/7)
=12/12-7/7
=1-1
=0

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