已知(2x²+mx+n)乘(-5x²)-2x²(x-1)不含x²和x³项,求m和n的值如题
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![已知(2x²+mx+n)乘(-5x²)-2x²(x-1)不含x²和x³项,求m和n的值如题](/uploads/image/z/9319335-15-5.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%882x%26%23178%3B%2Bmx%2Bn%EF%BC%89%E4%B9%98%EF%BC%88-5x%26%23178%3B%EF%BC%89-2x%26%23178%3B%EF%BC%88x-1%EF%BC%89%E4%B8%8D%E5%90%ABx%26%23178%3B%E5%92%8Cx%26%23179%3B%E9%A1%B9%2C%E6%B1%82m%E5%92%8Cn%E7%9A%84%E5%80%BC%E5%A6%82%E9%A2%98)
已知(2x²+mx+n)乘(-5x²)-2x²(x-1)不含x²和x³项,求m和n的值如题
已知(2x²+mx+n)乘(-5x²)-2x²(x-1)不含x²和x³项,求m和n的值
如题
已知(2x²+mx+n)乘(-5x²)-2x²(x-1)不含x²和x³项,求m和n的值如题
(2x²+mx+n)乘(-5x²)-2x²(x-1)
=-10x^4-5mx³-5nx²-2x³+2x²
=10x^4-(5m+2)x³-(5n-2)x²
根据题意得:
5m+2=0
5n-2=0
所以:
m=-2/5
n=2/5