Question

多项式（2mx²-x²+3x+1）-（5x²-5y²+3x）的值与x无关，求2m³+【2m²+（4

m-5）+m-9】的值。谢谢

Answer 1

项式(2mx²-x²+3x+1)-(5x²-5y²+3x)的值与x无关,

满足 2m-1 -5 = 0
m = 3

2m³+【2m²+（4m-5）+m-9】的值
= 2m³+【2m²+4m-5+m-9】
= 2m³+2m²+4m-5+m-9
= 2m³+2m²+5m-14
= 2x27 + 2x9 + 15 -14
= 73

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