若关于x、y的多项式mx³+3nxy²+2x²+2x³-xy²+y中不含三次项,求m+3n的值
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![若关于x、y的多项式mx³+3nxy²+2x²+2x³-xy²+y中不含三次项,求m+3n的值](/uploads/image/z/6932533-13-3.jpg?t=%E8%8B%A5%E5%85%B3%E4%BA%8Ex%E3%80%81y%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8Fmx%26%23179%3B%2B3nxy%26%23178%3B%2B2x%26%23178%3B%2B2x%26%23179%3B-xy%26%23178%3B%2By%E4%B8%AD%E4%B8%8D%E5%90%AB%E4%B8%89%E6%AC%A1%E9%A1%B9%2C%E6%B1%82m%2B3n%E7%9A%84%E5%80%BC)
若关于x、y的多项式mx³+3nxy²+2x²+2x³-xy²+y中不含三次项,求m+3n的值
若关于x、y的多项式mx³+3nxy²+2x²+2x³-xy²+y中不含三次项,求m+3n的值
若关于x、y的多项式mx³+3nxy²+2x²+2x³-xy²+y中不含三次项,求m+3n的值
m+2=0
m=-2
3n-1=0
n=1/3
m+3n=-2+1/3*3=-1