ini gimana yaaa isian ama cara nyari nya

no 1
[tex] {3}^{ - 3} = \frac{1}{27} \\ {9}^{ - 2} = \frac{1}{81} [/tex]
jadi
[tex] \frac{3}{81} + \frac{1}{81} = \frac{4}{81} [/tex]

no 2
-15+7x4-12:(-4)
= -15+28-12:(-4)
= -15+28+3
= 16