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divide 1 entre 2/5= 5/2
comprobando
2/5*5/2=1
a)2/5 x ___=1
R// 5/2
b)3/7 x ___=1
1/(3/7)=7/3
comprobando
3/7*7/3=1
R// 7/3
c)4/3 x ___=1
1/(4/3)=3/4
comprobando
4/3*3/4=1
R// 3/4