7/8*4/15-7/15*4/8的简便算法RT
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![7/8*4/15-7/15*4/8的简便算法RT](/uploads/image/z/134918-62-8.jpg?t=7%2F8%2A4%2F15-7%2F15%2A4%2F8%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95RT)
7/8*4/15-7/15*4/8的简便算法RT
7/8*4/15-7/15*4/8的简便算法
RT
7/8*4/15-7/15*4/8的简便算法RT
7/8*4/15-7/15*4/8
=7/8*(4/15-4/15)
=7/8*0
=0
7/8*4/15-7/15*4/8
=(7/15)*(4/8)-(7/15)*(4/8)
=0
7/8*4/15-7/15*4/8
=7/8*4/15-4/15*7/8
=7/8*(4/15-4/15)
=7/8*0
=0