(xy)²-4因式分解因式分解1:(xy)²-42:16a²-(2b)²3:-9+25x²

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(xy)²-4因式分解因式分解1:(xy)²-42:16a²-(2b)²3:-9+25x²
(xy)²-4因式分解
因式分解
1:(xy)²-4
2:16a²-(2b)²
3:-9+25x²

(xy)²-4因式分解因式分解1:(xy)²-42:16a²-(2b)²3:-9+25x²
1:(xy)²-4=(xy+2)(xy-2)
2:16a²-(2b)²=(4a-2b)(4a+2b)
3:-9+25x²=(5x-3)(5x+3)