X²-Y²-2X-4Y-3分解因式
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X²-Y²-2X-4Y-3分解因式
X²-Y²-2X-4Y-3分解因式
X²-Y²-2X-4Y-3分解因式
X²-Y²-2X-4Y-3
=(X-1)²-(Y²+4Y+4)
=(x-1-y-2)(x-1+y+2)
=(x-y-3)(x+y+1)
X²-Y²-2X-4Y-3
=(x-1)²-(y+2)²
=(x+y+1)(x-y-3)
X²-Y²-2X-4Y-3
=(X-1)²-(Y²+4Y+4)
=(x-1-y-2)(x-1+y+2)
=(x-y-3)(x+y+1)
把-3看成是1与-4的组合
X²-Y²-2X-4Y-3
=(X²-2X+1)-(Y²+4Y+4)
=(X-1)²-(Y+2)²
=(X-1+Y+2)(X-1-Y-2)
=(X+Y+1)(X-Y-3)