将下列式子因式分解：x-x²-y+y²=

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将下列式子因式分解：x-x²-y+y²=将下列式子因式分解：x-x²-y+y²=将下列式子因式分解：x-x²-y+y²=x-x²-

将下列式子因式分解：x-x²-y+y²=
将下列式子因式分解：x-x²-y+y²=

将下列式子因式分解：x-x²-y+y²=
x-x²-y+y²
=x-y-(x^2-y^2)
=(x-y)-(x-y)(x+y)
=(x-y)(1-x-y)

x-x²-y+y²=（x-y)-(x²-y²)=(x-y)-(x-y)(x+y)=(x-y)-(1-x-y)