要是多项式mx*x*x+3nxy²+2x*x*x-xy²+y不含三次式,则2m+3n的值为多少.
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![要是多项式mx*x*x+3nxy²+2x*x*x-xy²+y不含三次式,则2m+3n的值为多少.](/uploads/image/z/3776890-58-0.jpg?t=%E8%A6%81%E6%98%AF%E5%A4%9A%E9%A1%B9%E5%BC%8Fmx%2Ax%2Ax%2B3nxy%26%23178%3B%2B2x%2Ax%2Ax-xy%26%23178%3B%2By%E4%B8%8D%E5%90%AB%E4%B8%89%E6%AC%A1%E5%BC%8F%2C%E5%88%992m%2B3n%E7%9A%84%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91.)
要是多项式mx*x*x+3nxy²+2x*x*x-xy²+y不含三次式,则2m+3n的值为多少.
要是多项式mx*x*x+3nxy²+2x*x*x-xy²+y不含三次式,则2m+3n的值为多少.
要是多项式mx*x*x+3nxy²+2x*x*x-xy²+y不含三次式,则2m+3n的值为多少.
多项式mx*x*x+3nxy²+2x*x*x-xy²+y不含三次式
mx*x*x+3nxy²+2x*x*x-xy²+y
=(m+2)x^3+(3n-1)xy²+y
m+2=0 3n-1=0
m=-2 n=1/3
2m+3n
=2*(-2)+3*1/3
=-3