Explicación paso a paso:
1er n=×
2do nun= ×+1
×/2+×/5=×+1/3+×+1/4
7×/10=3(×+1)+4(×+1)/12
7×+10=3×+3+4×+4/12
7×+10=7×+7/12
12(7×+1)=7×+7
84×+12=7×+7
84×-7×= 7-12
77×=-4
×= -4/77
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Explicación paso a paso:
1er n=×
2do nun= ×+1
×/2+×/5=×+1/3+×+1/4
7×/10=3(×+1)+4(×+1)/12
7×+10=3×+3+4×+4/12
7×+10=7×+7/12
12(7×+1)=7×+7
84×+12=7×+7
84×-7×= 7-12
77×=-4
×= -4/77