вычислите:
А)2/9 + 5/9
Б)7/11 -3/11
В)1 -2/3
г)2/3 + 1/6
Д)3/7 - 5/14
E)2/5 + 1/3
ж)1/3 - 1/4
Решите уравнения
1-x=2/7
Решения:
Ответ:
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