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Sea x/y la fracción que se busca
4/15 x ? /? = 1/8
4/15 x x/y = 1/8
x/y = (1/8)/(4/15)
= (1x15)/(8x4)
= 15/32 La fracción es 15/32
?/? x 2/7 = 1/2
x/y x 2/7 = 1/2
x/y = (1/2)/(2/7)
= (1x7)/(2x2)
= 7/4 La fracción es 7/4
?/? x 7/2 = 9/8
x/y x 7/2 = 9/8
x/y = (9/8)/(7/2)
= (2x9)/(8x7)
= 18/56 La fracción es 9/28 (simplificando)