Решите уравнения : 1) (? - 2,5) * 4,2 = 6,3 2) 3,5 * (? + 2,25) = 14 3) (1,75 + ?) : 1,9 = 2,5 4) (7,1 - ?) : 3,6 = 1,5 Помогите пожалуйста,очень срочно!
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