已知x-y=2,那x²-2xy+4+y²=?
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已知x-y=2,那x²-2xy+4+y²=?
已知x-y=2,那x²-2xy+4+y²=?
已知x-y=2,那x²-2xy+4+y²=?
答:
x-y=2
x²-2xy+4+y²
=(x-y)²+4
=2²+4
=4+4
=8
x²-2xy+4+y²
=x²-2xy+y²+4
=(x-y)²+4
∵x-y=2
∴原式=2²+4=8