a = 1
b = 1
n = 1
while abs(b ** 2 / a ** 2 - 2) >= 0.01:
b = b + 2 * a
a = b - a
n = n + 1
print(n) # 4
Scratch解法：
a = 1
b = 1
n = 1
while abs(b ** 2 / a ** 2 - 2) >= 0.01:
b = b + 2 * a
a = b - a
n = n + 1
print(n) # 4
Scratch解法：
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