срочно помогите ПЖ​!!!!!

1.97.

3⁻³ = 1 / 3³ = 1/27,

2⁻³ = 1 / 2³ = 1/8,

5⁻² = 1 / 5² = 1/25,

а⁻² = 1/а²,

в⁻¹⁰ = 1/в¹⁰,

х⁻⁷ = 1/х⁷,

1.99

3х⁻⁵ = 3/х⁵,

5ху⁻² = 5х/у²,

а⁻¹в = в/а,

м⁻²н⁻³ = 1/м²н³,

а⁻³в² = в²/а³,

5(ху)⁻² = 5/(ху)²,

-8мн⁻³ = -8м/н³,

7х(х+у)⁻² = 7х/(х+у)²