

1, Mở ngoặc
a, [tex]\left ( 1-x \right )(1+x)(1+x^{2})[/tex]
b, [tex](x^{3}+y^{2})(x^{3}-y^{2})[/tex]
c, [tex](\frac{1}{2}x^{m}-y^{n})(\frac{1}{2}x^{m}+y^{n})[/tex]
a, [tex]\left ( 1-x \right )(1+x)(1+x^{2})[/tex]
b, [tex](x^{3}+y^{2})(x^{3}-y^{2})[/tex]
c, [tex](\frac{1}{2}x^{m}-y^{n})(\frac{1}{2}x^{m}+y^{n})[/tex]