a = float(input('1) Введите a: '))
print('a)', (a * a + 5) / (1 - 3 * a))
print('b)', 1 + (3 * a * a) / (1 + 3 * a))
x = float(input('2) Введите x: '))
y = -2.7 * x + 0.23 * x * x - 1.4
print('y =', y)
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a = float(input('1) Введите a: '))
print('a)', (a * a + 5) / (1 - 3 * a))
print('b)', 1 + (3 * a * a) / (1 + 3 * a))
x = float(input('2) Введите x: '))
y = -2.7 * x + 0.23 * x * x - 1.4
print('y =', y)