简便计算:(5/12-3/7)-(4/7-7/12) =简便计算:(5/12-3/7)-(4/7-7/12)===

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简便计算:(5/12-3/7)-(4/7-7/12) =简便计算:(5/12-3/7)-(4/7-7/12)===

简便计算:(5/12-3/7)-(4/7-7/12) =简便计算:(5/12-3/7)-(4/7-7/12)===
简便计算:(5/12-3/7)-(4/7-7/12) =
简便计算:(5/12-3/7)-(4/7-7/12)
=
=
=

简便计算:(5/12-3/7)-(4/7-7/12) =简便计算:(5/12-3/7)-(4/7-7/12)===
(5/12+7/12)-(3/7+4/7)
=1-1
=0

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