数学题已知代数式(2x+m)(3x+2)-nx(x+3)+5的值与x的值无关,求mn的值
问题描述:
数学题已知代数式(2x+m)(3x+2)-nx(x+3)+5的值与x的值无关,求mn的值
答
6x2 + 4x +2m + 3mx - nx2 - 3nx +5
= (6-n)x2 + (4+3m -3n)x +5
n = 6 m = 14/3