[tex](x^2 x \frac{1}{x} \frac{1}{x^2})^7[/tex]

۱/ [tex]x^2x^2x^2x^2\frac{1}{x^2}\frac{1}{x}\frac{1}{x}[/tex]
۲/ [tex]x^2x^2x^2xx\frac{1}{x^2}\frac{1}{x^2}[/tex]
۳/ [tex]x^2x^2x^2x\frac{1}{x}\frac{1}{x}\frac{1}{x}[/tex]
۴/ [tex]x^2x^2xxx\frac{1}{x^2}\frac{1}{x}[/tex]
۵/ [tex]x^2xxxx\frac{1}{x}\frac{1}{x}[/tex]
۶/ [tex]xxxxxx\frac{1}{x^2}[/tex]

[tex]\binom{7}{4}\binom{3}{1}\binom{2}{2}=105[/tex]

[tex]\binom{7}{3}\binom{4}{2}\binom{2}{2}=210[/tex]

[tex]\binom{7}{3}\binom{4}{1}\binom{3}{3}=140[/tex]

[tex]\binom{7}{2}\binom{5}{3}\binom{2}{1}\binom{1}{1}=420[/tex]

[tex]\binom{7}{1}\binom{6}{4}\binom{2}{2}=105[/tex]

[tex]\binom{7}{6}\binom{1}{1}=7[/tex]