1. Найти число а, если 4/7 от а равны -40% от 80. 2. 2 2/3: 3 1/3 = х: 3, 5
3. 1, 2 + 3/10 у + 0, 78
4. 8- 4,2: ( 2 5/14 - 1 4/21)
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