a²b²-a²-b²-4ab+1
=a²b²-2ab+1-a²-b²-2ab
=(ab-1)²-(a+b)²
=(ab-1+a+b)(ab-1-a-b)
x³+x²-12
=x³-8+x²-4
=(x-2)(x²+2x+4)+(x+2)(x-2)
=(x-2)(x²+2x+4+x+2)
=(x-2)(x²+3x+6)
(4a²+b²-1)²-16
=(4a²+b²-1+4)(4a²+b²-1-4)
=(4a²+b²+3)(4a²+b²-5)
如果不懂,祝学习愉快!
a²b²-a²-b²-4ab+1
=a²b²-2ab+1-a²-b²-2ab
=(ab-1)²-(a+b)²
=(ab-1+a+b)(ab-1-a-b)
x³+x²-12
=x³-8+x²-4
=(x-2)(x²+2x+4)+(x+2)(x-2)
=(x-2)(x²+2x+4+x+2)
=(x-2)(x²+3x+6)
(4a²+b²-1)²-16
=(4a²+b²-1+4)(4a²+b²-1-4)
=(4a²+b²+3)(4a²+b²-5)
如果不懂,祝学习愉快!