limx趋向于∞ (a+1)x^3+bx^2+2/2x^2+x+1=-2,求a,b的值.
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![limx趋向于∞ (a+1)x^3+bx^2+2/2x^2+x+1=-2,求a,b的值.](/uploads/image/z/7834910-14-0.jpg?t=limx%E8%B6%8B%E5%90%91%E4%BA%8E%E2%88%9E+%28a%2B1%29x%5E3%2Bbx%5E2%2B2%2F2x%5E2%2Bx%2B1%3D-2%2C%E6%B1%82a%2Cb%E7%9A%84%E5%80%BC.)
limx趋向于∞ (a+1)x^3+bx^2+2/2x^2+x+1=-2,求a,b的值.
limx趋向于∞ (a+1)x^3+bx^2+2/2x^2+x+1=-2,求a,b的值.
limx趋向于∞ (a+1)x^3+bx^2+2/2x^2+x+1=-2,求a,b的值.
lim(x->∞)[(a+1)x^3+bx^2+2] /[2x^2+x+1 ]=-2
a+1 =0
=> a=-1
and
b/2 = -2
b= -4