kerjakan no 1 pakai cara dan nama rumusnya

[tex]3^{-3}+9^{-2}= \frac{1}{27}+\frac{1}{81}[/tex]
[tex]\frac{1}{27}+\frac{1}{81}=\frac{3}{81}+\frac{1}{81}[/tex]
[tex]\frac{3}{81}+\frac{1}{81}=\frac{4}{81}[/tex]

[tex]3 { }^{ - 3} + 9 {}^{ - 2} = \\ 3 {}^{ - 3} + (3 {}^{2} ) {}^{ - 2} = \\ 3 {}^{ - 3} +3 {}^{ - 4} = \\ \frac{1}{27} + \frac{1}{81} = \\ \frac{3}{81} + \frac{1}{81} = \\ \frac{4}{81} [/tex]