limit fungsi aljabar1

1.    $_{x\to 1}^{\lim }\frac{3x+x\sqrt{x}-4}{\sqrt{x}-1}$
2.    $_{x\to 2}^{\lim }\,\frac{\left( x-2 \right)\left( {{x}^{4}}+2{{x}^{3}}-4{{x}^{2}}-8x+32 \right)}{{{x}^{2}}+2x-8}$
3.    $_{x\to 1}^{\lim }\,\frac{\sqrt{x+3}-2}{\sqrt[3]{x}-1}$
4. $_f\left( x \right)={{x}^{2}}-2x+4\,$  tentukan $_{h\to 0}^{\lim }\,\frac{f\left( x+h \right)-f\left( x \right)}{h}$