вычислите, используя распределительное свойство умножения
1) 4,8 * 2,9 + 4,8 * 7,1
2) 3 9/14 * 7/9 - 2 5/14 * 7/9
3) 3 9/14 * 0.3 - 0.3 * 1 10/21 + 0.3 * 1 1/6
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