A² - B² = (A + B)(A - B) 基礎 Flashcards
1
Q
X² - Y²
A
(X + Y)(X - Y)
2
Q
X² - 16
A
X² - 4²
= （X + 4)(X - 4)
3
Q
100 - a²
A
10² - a²
=(10 - a)(10 + a)
4
Q
25x² - 64y²
A
(5x)² - (8y)²
=(5x + 8y)(5x - 8y)
5
Q
49r² - 81s²
A
(7r)² - (9s)²
=(7r + 9s)(7r - 9s)
