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""" 分段函数求值
3x - 5 (x > 1) f(x) = x + 2 (-1 <= x <= 1) 5x + 3 (x < -1)
Version: 0.1 Author: 骆昊 Date: 2018-02-28 """ x = float(input('x = ')) if x > 1:
y = 3 * x - 5
elif x >= -1:
y = x + 2
else:
y = 5 * x + 3
print('f(%.2f) = %.2f' % (x, y))