25/17-1/3x9/8-5/8;1/5x27+3/5x41;1/4x39+3/4x27这几道题的简便算法

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25/17-1/3x9/8-5/8;1/5x27+3/5x41;1/4x39+3/4x27这几道题的简便算法
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25/17-1/3x9/8-5/8;1/5x27+3/5x41;1/4x39+3/4x27这几道题的简便算法
25/17-1/3x9/8-5/8;1/5x27+3/5x41;1/4x39+3/4x27这几道题的简便算法

25/17-1/3x9/8-5/8;1/5x27+3/5x41;1/4x39+3/4x27这几道题的简便算法
(25/17)-(1/3)*(9/8)-(5/8)
=25/17-[(3/8)+(5/8)]
=25/17-1
=8/17
(1/5)*27+(3/5)*41
=(1/5)*27+(3/5)*27+(3/5)*14
=27*[(1/5)+(3/5)]+(3/5)*14
=27+42/5
=177/5
(1/4)*39+(3/4)*27
=(1/4)*27+(1/4)*12+(3/4)*27
=27*[(1/4)+(3/4)]+(1/4)*12
=27+3=30
个人觉得第二题有点问题,如果真的确定没错的话,那简不简便都没关系,
如果真的有错的话,请依照上面的做法,把其中一个乘数拆开来做就行了.

拿计算器算,最好用Casio fx-82型的,可以算分数。要不用matlab也行