ВЫПОЛНИТЕ УМНОЖЕНИЕ.
11/15 * 21/22 * 9/28 * 8/9
2 1/2 * 3 1/3 * 4 1/5 * 8/35
11/15 * 21/22 * 9/28 * 8/9
2 1/2 * 3 1/3 * 4 1/5 * 8/35
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11/15 * 21/22 * 9/28 * 8/9=1/52 1/2 * 3 1/3 * 4 1/5 * 8/35=5/2×10/3×21/5=21
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