lim(x→∞)[(a x^2)/x+1]+bx=lim(x→∞)(a x^2)+bx(x+1) / x+1=lim(x→∞)(a+b)x^2+bx / x+1 //搞不懂,为什么就可以判定a+b=0了=2

Lim [x^2/(x^2-1)]^x (x→∞) lim(1+x/x)2x (x→∞) x→+∞,lim（1+a/x)^x=? lim(x→0)(a^2x-1)/4x 定积分：(1) lim(x→a) 1/(x-a) ∫[a,x] f(t)dt(2) lim(x→∞) ∫[x,x+1] (sint)/t dt 利用罗必达法则求极限lim x→∞x^n/e^ax(a>0,n为正整数)lim x→1 lnx/(x-1)lim (x^-3x^2+2)/(x^3-x^2+x+1) 高数试题利用落必达法则求极限lim x→∞x^n/e^ax(a>0,n为正整数)lim x→1 lnx/(x-1)lim (x^-3x^2+2)/(x^3-x^2+x+1) lim(x)lim(x→∞) [(x-1)/(x+1)]^2x 为什么 lim(x->∞) {[(-2)/(x+1)]*2x} = -4 x/2-1lim(1-2/x)x→∞ lim(x→∞)(1-2/x) (x+1)次方 lim(x→∞)[1+(1/x)]^x/2 lim(x→∞)(1-2/x)^2x lim x→∞(2x+1)/(3x-4) lim x→∞ x-1/x^2 lim x→∞(1-2/x)^x= 求lim(√x^2+1)-x x→-∞ 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 两条极限,求详细过程lim(x→∞）e^(2x^2-3/x^2+1)lim(x→a）sinx-sina/x-a