Question

X的平方y减4y的三次方的因式分解？

Answer 1

解x^2y-4y^3
=y(x^2-4y^2)
=y(x+2y)(x-2y)

Answer 2

X^2-Y^2-2X-4Y-3
=(X^2-2X+1)-(Y^2-4Y+4)
=(X-1)^2-(Y-2)^2
=(X+Y-3)(X-Y+1)。