()²=x²-8xy+()(-a-4b)²=()若(x-3y)²=x²-6xy+(ky)²,则K=
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()²=x²-8xy+()(-a-4b)²=()若(x-3y)²=x²-6xy+(ky)²,则K=
()²=x²-8xy+()(-a-4b)²=()若(x-3y)²=x²-6xy+(ky)²,则K=
()²=x²-8xy+()(-a-4b)²=()若(x-3y)²=x²-6xy+(ky)²,则K=
(x-4y)²=x²-8xy+(16y²)
(-a-4b)²=a²+8ab+16b²
若(x-3y)²=x²-6xy+(ky)²,则K=9