因?yàn)樗缓雾?xiàng)【二次項(xiàng)系數(shù)要為0,就不含二次項(xiàng)了】
所以：a-2=0
2b+1=0
解得：a=2
b=-1/2
所以3a-8b
=3×2-8×（-1/2)
=6+4
=10
(a-2)x^2+(2b+1)xy-x+y-7是關(guān)于x,y的多項(xiàng)式,若它不含有2次項(xiàng),試求3a-8b的值
(a-2)x^2+(2b+1)xy-x+y-7是關(guān)于x,y的多項(xiàng)式,若它不含有2次項(xiàng),試求3a-8b的值
數(shù)學(xué)人氣：518 ℃時(shí)間：2019-11-06 12:33:06
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