Question

(15,4+x)×5=105,5 хэлп, математика зло​

Answer 1

$(15.4 + x) \times 5 = 105.5 \\ 77 + 5x = 105.5 \\ 5x = 105.5 - 77 \\ 5x = 28.5 \\ x = 5.7$

надеюсь помог))