Please complete all 4 I would more than be happy to thumbs u

Please complete all 4 I would more than be happy to thumbs up!!!!

Simplify the expression and write your answer using positive exponents only.

Simplify the expression a r answer using positive exponents only. x-2y-12

1) [(x^2y^-2z^-5)^(-3)/(x^-2y^-1z^2)^-3]^3

[x^(2*-3)y^(-2*-3^)z^(-5*-3)/(x^-6y^3z^-6)]^3

=x^-18y^(18)z^(45)/x^-18y^9z^-18

= z^63y^9

2) ( x^-1 - y^-1)/(x^-1 +y^-1)

(1/x -1/y) / ( 1/x +1/y

( y -x)/xy / (y +x)/xy

(y-x)/(y+x)

3) (uv^)^-1 / (u^-1 +v^-1)

1/uv(u^-1 +v^-1)

= 1/(v +u)

4) (2u^2v^-3)^-1 *5(3u^2v^2)^-2

= 2^-1u^-2v^3*5(3^-2u^-4v^-4)

=(5/2))u^-6v^-1

= 5/2u^6v