(1,5)^-2 +3^-3×21= найдете значение выражения

Question

(1,5)^-2 +3^-3×21=
найдете значение выражения

Answer 1

1,5⁻² + 3⁻³ *21 = (3/2)⁻² + 7*3*3⁻³ = (2/3)² + 7/3² = 4/9 + 7/9 = 11/9 = 1 2/9

Answer 2

1) ( 1,5 ) ^ - 2 = ( 3/2 ) ^ - 2 = ( 2/3 ) ^ 2 = 4/9
2) 3 ^ - 3 = 1/27
3) 1/27 • 21 = 21/27
3) 4/9 + 21/27 = 12/27 + 21/27 = 33/27 = 11/9 = 1 2/9
Ответ 1 2/9