Problem 3: Diff of Two Squares (100pts)

Problem

写一个代表变量 \(a\) 和 \(b\) 的平方差 \(a^2−b^2\) 的算术表达式，来替换掉下面diff_square函数中的下划线。

def diff_square(a, b):
    """Compute the difference of square a and square b.

    Expected result:
    >>> diff_square(3, 2)
    5
    >>> diff_square(3, 4)
    -7
    """
    return ______

Hints

• 回想一下上课讲了什么。很简单的

Solutions

def diff_square(a, b):
    return a ** 2 - b ** 2

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def diff_square(a, b):
    return a * a - b * b

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使用 pow 函数（多此亿举...）

def diff_square(a, b):
    return pow(a, 2) - pow(b, 2)