657 номер Вычисли По действиям!, 1) (3 1/3+5 1/5)×2/5-2 3/4:(1 1/2-2/5); 3) (1/8+2/9-1/4)×5 1/7:(7/9-2/3 +1/6).
Пажалуйста помогите поставлю 5☆​
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