Решите уравнения 1. 2,7: (3,2х-15,7)=9. 2. (х:5,2+6,9) :4,3=3. 3. 2×(4,5х+3,1)=25,1. 4. 3× (15,9-х:2,4)=35,7. ПОМОГИТЕ ПОЖАЛУЙСТА !!!!!!!!!!!!!! заранее спасибо
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