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RT7/8*4/15-7/15*4/8的简便算法RT7/8*4/15-7/15*4/8的简便算法RT7/8*4/15-7/15*4/8=7/8*(4/15-

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