题目内容
在实数范围内分解因式:2x2-2xy-y2=______.
2x2-2xy-y2=2(x2-xy+
y2)-
y2=2(x-
y)2-
y2=(
x-
y+
y)(
x-
y-
y)=(
x+
y)(
x-
y).
故答案为:(
x+
y)(
x-
y).
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故答案为:(
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