x²-xy+4分之y²
=x²-2×x×2分之y+(2分之y)²
=(x-2分之y)²
x²y-2xy²+y³
=y(x²-2xy+y²)
=y(x-y)²
a(x-y)-b(y-x)+c(x-y)
=a(x-y)+b(x-y)+c(x-y)
=(x-y)(a+b+c)
(x+y)²-16(x-y)²
=(x+y)²-[4(x-y)]²
=[(x+y)-4(x-y)][(x+y)+4(x-y)]
=(-3x+5y)(5x-3y)
=-(3x-5y)(5x-3y)
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(x-1/2y)²
y(x-y)²
(a+b+c)(x-y)
(5x-3y)(5y-3x)