Răspuns:
[tex](100 - x \div 76) \times 35 = 875 \\ (100 - x \div 76) = 25 \\ (x \div 76 - 100) = 25 \\ x \div 76 = 125 \\ x = 9500[/tex]
[tex] {5}^{4} \div {5}^{2} + 5 \times ( {55}^{1} - x) = {5}^{3} \\ {5}^{2} + 5 \times (55 - x) = {5}^{3} \\ (x - 55) \times 5 + 25 = 125 \\ (x - 55) \times 5 = 100 \\ x - 55 = 500 \\ x = 555[/tex]
