Răspuns
Explicație pas cu pas:
15/4 *1/18 = 5/4 *1/6 = 5/24
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12/5 * 7/16 = 3/5 * 7/4 = 21/20
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20/7*49/30 = 2/1 * 7/3 = 14/3
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5/21 * 14/15 = 1/3 * 2/3 = 2/9
25/16 * 8/15 = 5/2 * 1/3 = 5/6
