x²-4xy-1+4y²=7.77²+4.46×7.77+2.23²=要有过程哈,兄弟们走起~

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x²-4xy-1+4y²=7.77²+4.46×7.77+2.23²=要有过程哈,兄弟们走起~
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x²-4xy-1+4y²=7.77²+4.46×7.77+2.23²=要有过程哈,兄弟们走起~
x²-4xy-1+4y²=
7.77²+4.46×7.77+2.23²=
要有过程哈,兄弟们走起~

x²-4xy-1+4y²=7.77²+4.46×7.77+2.23²=要有过程哈,兄弟们走起~
x²-4xy-1+4y²
=x²-4xy+4y²-1
=(X-2Y)²-1
=(X-2Y+1)(X-2Y-1)
7.77²+4.46×7.77+2.23²
=7.77²+2×2.23×7.77+2.23²
=(7.77+2.23)²
=10²
=100

x^2-4xy+4y^2-1
=(x-2y)^2-1
=(x-2y+1)(x-2y-1)