Решите по действиям пожалуйста.
ПРИМЕРЫ
б) 2,5•13,57 + 26,43•2,5
в) 208,6 – 3,612 : ( 0,015 + 0,075•5,4 )
Уравнение

а) (4,479 – 3х) : 0,06 + 6,4 = 80
б) (72 – 8х)•16 + 15 = 15
в) (5,3х + 6,9х – 4,3х – 86,9) (4х – х + 5х – 976) = 0
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