lim(x→∞)[(8x^4+12x^3+1)/(4x^4-9x^2+5x+2)+sin3x/x]如图因为用文字表达的话括弧太多了,能用截图回答最好,

几道大学微积分求极限的题1,lim(x→∞)｛(x-3)^12(2x+1)^8/(3x-1)^20｝2,lim(x→+∞)｛(3x³+5x²+4)/[(√x^6)+2]｝3,lim(x→∞)[x+³√(1-x³)]4,lim(x→1)｛[√(x+3)-2]/√x-1｝ lim x→∞(2x+1)/(3x-4) lim（ x→∞）（1+x / x)^3x lim(x→∞)(4x^3+2x-1)/(2x^3-3x+1) lim(x→∞)(7x^3+4x)/(2x^3-x^2+3)=? lim(x→∞)(x^2+x)/(x^4-3x-1)的极限 求极限lim(x→2)(x^2-3x+2)/(x^2+4x-12) 计算 x→∞　,lim(2X^3-3X^2+4/5X-X^2-8),谢啦 lim(x-cosx)/x x→-∞ lim(x→∞)(cos1/x)^x 烦人的数学微积分1、lim(x→0)Sin3x/Sin2x2、lim(x→0)x/3*Sin3x3、lim(x→0)[Xsin(3/x)+(tanx/2x)]4、lim(x→3)Sin(x-3)/(X^2-X-6)5、lim(x→∞)[1+(1/2x)^x6、lim(x→∞)(x+3/x)^x7、lim(x→0)（1-x/2)^1/x+118、求下列函数的间断 lim(x)lim(x→∞) [(x-1)/(x+1)]^2x 为什么 lim(x->∞) {[(-2)/(x+1)]*2x} = -4 lim(x→∞)[5X*(tan2/3x)] lim(√(4x²-8x+5)+2x+1),x→-∞怎么解? lim 3x^2-3x+2／x^2-4 求极限x→∞ lim(x→∞)（根号4x²-3x+2）/2x等于多少? lim (x→∞)(4+3x)^2/x(1-x^2) lim(x→-∞）[﹙√（x²+2x+4)/(2x+3)