Ответ:

  1. \(x + 125 = 230 + 25\)

    \(x + 125 = 255\)

    \(x = 255 - 125 = 130\)

  2. \(a - 37 = 54\)

    \(a = 54 + 37 = 91\)

  3. \(b \cdot 36 = 72 \cdot 16\)

    \(b \cdot 36 = 1152\)

    \(b = 1152 : 36 = 32\)

  4. \(1836 : (x - 26) = 18\)

    \(x - 26 = 1836 : 18 = 102\)

    \(x = 102 + 26 = 128\)

Ответ: а) 130; б) 91; в) 32; г) 128.