计算下列各极限lim x^2+2x-2x->-1 ---------x^2+1 limx->无穷 (1+1/x)(2-1/x^2)limx->-1 (x^2+2x-2)/(x^2+1)

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计算下列各极限limx^2+2x-2x->-1---------x^2+1limx->无穷(1+1/x)(2-1/x^2)limx->-1(x^2+2x-2)/(x^2+1)计算下列各极限limx^2

计算下列各极限lim x^2+2x-2x->-1 ---------x^2+1 limx->无穷 (1+1/x)(2-1/x^2)limx->-1 (x^2+2x-2)/(x^2+1)
计算下列各极限
lim x^2+2x-2
x->-1 ---------
x^2+1
lim
x->无穷 (1+1/x)(2-1/x^2)
lim
x->-1 (x^2+2x-2)/(x^2+1)

计算下列各极限lim x^2+2x-2x->-1 ---------x^2+1 limx->无穷 (1+1/x)(2-1/x^2)limx->-1 (x^2+2x-2)/(x^2+1)
1.lim(x^2+2x -2)/(x^2+1)=
只要把x=-1代人上面式子即可
所以:lim(x^2+2x -2)/(x^2+1)=(1-2-2)/(1+1)=-3/2
2.lim
x->无穷 (1+1/x)(2-1/x^2)
当x趋向∞时,1/x趋向0.1/x^2趋向0
所以:lim
x->无穷 (1+1/x)(2-1/x^2)=(1+0)(2-0)=2