(3x+___)²=____+12xy+____.已知:(x-3y)²=x²-6xy+(ky)²,则k=____.

问题描述:

(3x+___)²=____+12xy+____.已知:(x-3y)²=x²-6xy+(ky)²,则k=____.

(3x+_2y__)²=_9x²__+12xy+_4y_²__.
(x-3y)²=x²-6xy+(ky)²,则k=3答案到底是3还是9啊 亲~~x-3y)²=x²-6xy+(3y)²=x²-6xy+3²y²是3