Susah bro bantu lagi la

Susah bro bantu lagi la

${2}^{ - 2} + {3}^{ - 3} + {1}^{ - 4 } = .... \ jawab \ = frac {1}{2 {}^{2} } + frac{3}{3 {}^{3} } + 1 \ = frac{1}{4} + frac{3}{27} + 1 \ = frac{139}{108} = 1 frac{39}{108}$