limx趋向于-2(x-4)/(x+2)=-4 求证明 用极限定义哦~

limx趋向于2 ,5x/x^2-4=? limx^3+2/3x+4 x趋向于无穷? limx趋向无穷大 2^x limx趋向于无穷(cos1/x)^(x^2)的极限 limx趋向于无穷(cos1/x)^(x^2)的极限 limx趋向于无穷x^2+2x-4/x^3-x^2 limx趋向于0,ln(1+2x)/xsinx limx趋向于0 xln(sin(x^2)) limx趋向于无穷2x^2-4/3x^2-x limx趋向于无穷时4x^3-2x+8/3x^2+1 limx趋向于无穷大((2+e^(1/x))/(1+e^(4/x)+sinx/|x|) 计算limx^2y/x^2+y^2,x趋向于0.y趋向于1~ limx趋向于-2(x-4)/(x+2)=-4 求证明 用极限定义哦~ 高数求极限 limx趋向于3 (1-X/3)的1/x-3次方limx趋向于3 (X/3)的1/x-3次方limX趋向于无穷 （X-2/X+2）的X次方 limx趋向2 lnx-ln2/x-2 limx趋向0 ln(cosx)/x^2 limx趋向于-1(3x^2-5x-2)/（4x^2-2x+1）的极限 limx趋向于0负x^2+2x/绝对值x(x+1)等于多少