28/5 * 2/7 = 21/4 : х
8/5 = 21/4 : х
х = 21/4 : 8/5
х = 21/4 * 5/8
х = 105/32
х = 3 9/32
Решение в прикрепленных файлах
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28/5 * 2/7 = 21/4 : х
8/5 = 21/4 : х
х = 21/4 : 8/5
х = 21/4 * 5/8
х = 105/32
х = 3 9/32
Verified answer
Решение в прикрепленных файлах