Respuesta :
5/8×18/25=5 × 18/8 × 25=90/200=90 ÷ 10/200 ÷ 10=9/20
9/20×4/9=9 × 4/20 × 9=36/180=36 ÷ 36/180 ÷ 36=15
9/20×4/9=9 × 4/20 × 9=36/180=36 ÷ 36/180 ÷ 36=15