Question

[Cô nàng Thiên Yết]

Rút gọn biểu thức :

1. \(\frac{2^{4m}-2^{4n}}{2^{2n}+2^{2m}}\)

2. \(\frac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{ab^2-ac^2-b^3+bc^2}\)

3. \(\frac{2x^3-7x^2-12x+45}{3x^3-19x^2+33x-9}\)

4. \(\frac{x^3-y^3+z^3+3xyz}{\left(x+y\right)^2+\left(y+x\right)^2+\left(z-x\right)^2}\)

5. \(\frac{x^3+y^3+x^3-3xyz}{\left(x-y\right)^2+\left(y-z\right)^2+\left(z-x\right)^2}\)

Please, help me!~~~ Pt2