当k等于多少时,多项式x²+3kxy-5y²-2分之1xy中不含xy
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 01:43:57
![当k等于多少时,多项式x²+3kxy-5y²-2分之1xy中不含xy](/uploads/image/z/3021492-12-2.jpg?t=%E5%BD%93k%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%E6%97%B6%2C%E5%A4%9A%E9%A1%B9%E5%BC%8Fx%26%23178%3B%2B3kxy-5y%26%23178%3B-2%E5%88%86%E4%B9%8B1xy%E4%B8%AD%E4%B8%8D%E5%90%ABxy)
当k等于多少时,多项式x²+3kxy-5y²-2分之1xy中不含xy
当k等于多少时,多项式x²+3kxy-5y²-2分之1xy中不含xy
当k等于多少时,多项式x²+3kxy-5y²-2分之1xy中不含xy
x²+3kxy-5y²-2分之1xy
=x²+(3k-2分之1)xy-5y²
由题意:
3k-2分之1=0
所以:
3k=2分之1
k=6分之1