Rút gọn biểu thức :
1. \(\frac{x^6+2x^3y^3+y^6}{x^7-xy^6}\)
2.\(\frac{a^2+b^2-c^2+2ab}{a^2-b^2+c^2+2ac}\)
3.\(\frac{x^2+a^2-b^2-2bc+2ax-c^2}{x^2+b^2-a^2+2bx-2ac-c^2}\)
4. \(\frac{3x^3-2x^2+4x-5}{6x^2+3x-9}\)
5. \(\frac{3^{3x}-3^{3y}}{3^x+3^y}\)
Please, help me!~~~
dai vcl
\(1,\frac{x^6+2x^3y^3+y^6}{x^7-xy^6}=\frac{\left(x^3+y^3\right)^2}{x\left(x^6-y^6\right)}=\frac{\left(x^3+y^3\right)^2}{x\left(x^3-y^3\right)\left(x^3+y^3\right)}=\frac{x^3+y^3}{x\left(x^3-y^3\right)}\)
\(2,=\frac{\left(a+b\right)^2-c^2}{\left(a+c\right)^2-b^2}=\frac{\left(a+b+c\right)\left(a+b-c\right)}{\left(a+b+c\right)\left(a+c-b\right)}=\frac{a+b-c}{a+c-b}\)
pt thành nhân tử là ra