A)a + (a-30) + 4*(a-30) = 108a + a - 30 + 4a - 120 = 1086a - 150 = 1086a = 258a = 43
Ответ: a = 43
Б)b + (b+12) + 2*(b+12) = 164b + b + 12 + 2b + 24 = 1644b + 36 = 1644b = 128b = 32
Ответ: b = 32
A)
a + (a-30) + 4*(a-30) = 108
a + a - 30 + 4a - 120 = 108
6a - 150 = 108
6a = 258
a = 43
Ответ: a = 43
Б)
b + (b+12) + 2*(b+12) = 164
b + b + 12 + 2b + 24 = 164
4b + 36 = 164
4b = 128
b = 32
Ответ: b = 32