5除以(2/3+1/5)乘1/13
=5÷(10/15+3/15)x1/13
=5÷13/15x1/13
=5x15/13x1/13
=75/169
=169分之75
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根据你描述的有这两种情况,第一种有简化算法,第二种没有,最好把式子完整写下来,而不是用文字描述,不能确定式子是什么。
1、将2/3和1/5通分,可以消掉13。
5÷[(2/3+1/5)X1/13]
=5÷[(10/15+3/15)X1/13 ] 注: 分母变成15进行通分
=5÷[(13/15)X1/13 ] 注:括号内相加变成13/15,和后面1/13相乘消掉13
=5÷1/15
=5X15
=75
2、
5÷(2/3+1/5)X1/13
=5÷(10/15+3/15)X1/13
=5÷(13/15)X1/13
=5X(15/13)X1/13
=(5X15)/(13X13 )
=75/169
,。
5÷(2/3+1/5)×1/13
=(5×3/2+5×5)×1/13
=(15/2+25)×1/13
=15/2×1/13+25×1/13
=15/26+25/13
=15/26+50/26
=65/26
5除以(2/3+1/5)乘1/13
=5÷(13/15)*(1/13)
5*(15/13)*(1/13)
=5*15/(13*13)
=75/169