Răspuns:
Explicație pas cu pas:
2/3 : 5/7 = 2/3*7/5 = 14/15
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7/8 : 3/5 = 7/8*5/3 = 35/24
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9/4 : 2/5 = 9/4*5/2 = 45/8
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8/9 : 3/7 = 8/9*7/3 = 56/27
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5/9:7/2 = 5/9*2/7 = 10/63
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6/5:7/8 = 6/5*8/7 = 48/35