Hello! I have a few questions from my maths book that I'm really struggling to understand.. please help!

ab[tex]\frac{1}{a}[/tex][tex]b^{2}[/tex][tex]cb^{-3}[/tex]

[tex]\frac{a(b+c)-ca}{b}[/tex]

[tex]\frac{a}{c\sqrt[3]{b} }[/tex] [tex]\frac{b\frac{4}{3} }{a^{2} }[/tex]

[tex]\frac{27a^{2} }{\sqrt{9abba} }[/tex]