21/2 : 3/5 = 21/2 * 5/3 = 7/2 * 5 = 35/2 = 17 1/2 или 17,5
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21/2 : 3/5 = 21/2 * 5/3 = 7/2 * 5 = 35/2 = 17 1/2 или 17,5