limx->0 (x+1)/(x^3+7x^2)等于多少?

limx->0 ln(1+3x)/sin4x limX->0 x^3-7x/x^3 ,... limx-0(1-3根号1-x+x^2)/x 1.limx→∞(1-1/2x)^x 2.limx→∞(1﹢x／x)^2x 3.limx→∞(1+1/x+3)^x 4.limx→0(1+2x)^1/x limx→0 5x-sinx/3x+7sinx Limx-0 (1-3/x)^(x/3-1) limx趋近于0 x^3-1/x-1 limx→0 (sinx/x)∧(1/x∧3) limx趋近于0sin2xln(1+x)/4x^3 如何求limx→0（3^x-1)/x limx->0,((1+x)^n-1)/x limx→0(1-x)^(1/x) limx→0{(tanx-x)/x^3} limx→0(1-x)^x= limx->0 (x+1)/(x^3+7x^2)等于多少? limx→-1(x^3/x+1) 求3个极限:limx→0 sin3x/2x=?limx→∞ xsin(1/x)=?limx→0 [sin(1/x)]/(1/x)=? limx→1 x^2-x+1/x-1= limx→0+x^sinx=