关于xy的多项式mx³-3nxy²-2x³-xy²-y中不含三次项,求2m-3n急着要用阿鲁谢谢阿鲁.
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/23 16:14:39
![关于xy的多项式mx³-3nxy²-2x³-xy²-y中不含三次项,求2m-3n急着要用阿鲁谢谢阿鲁.](/uploads/image/z/5260815-63-5.jpg?t=%E5%85%B3%E4%BA%8Exy%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8Fmx%26%23179%3B-3nxy%26%23178%3B-2x%26%23179%3B-xy%26%23178%3B-y%E4%B8%AD%E4%B8%8D%E5%90%AB%E4%B8%89%E6%AC%A1%E9%A1%B9%2C%E6%B1%822m-3n%E6%80%A5%E7%9D%80%E8%A6%81%E7%94%A8%E9%98%BF%E9%B2%81%E8%B0%A2%E8%B0%A2%E9%98%BF%E9%B2%81.)
关于xy的多项式mx³-3nxy²-2x³-xy²-y中不含三次项,求2m-3n急着要用阿鲁谢谢阿鲁.
关于xy的多项式mx³-3nxy²-2x³-xy²-y中不含三次项,求2m-3n
急着要用阿鲁谢谢阿鲁.
关于xy的多项式mx³-3nxy²-2x³-xy²-y中不含三次项,求2m-3n急着要用阿鲁谢谢阿鲁.
解
mx³-3nxy²-2x³-xy²-y
=(mx³-2x³)-(3nxy²+xy²)-y
=(m-2)x³-(3n+1)xy²-y
∵不含三次项
∴m-2=0,3n+1=0
∴m=2,n=-1/3
∴2m-3n
=2×2-3×(-1/3)
=4+1
=5
去屎吧你 哈哈哈哈哈哈