Simplify :
`((-2)^3 xx (-2)^7)/(3 xx (4)^6)`

Simplify : (3 xx 2)^4

Simplify : ((-2)/(3))^(-2) xx ((4)/(5))^(-3)

Simplify: (-7)^2 xx (-9)^2 xx (-6)^3

Simplify: (6/7)^3 xx (7/6)^2 xx ((-6)/8)^3

Simplify : (2/3)^2 xx (4/9)^2 xx (2/3)^(-4)

Simplify: (-3)^2xx(-1)^3xx(-6)^3xx(-2)

Simplify: (((-2)/3)^(-2))^(3)xx(1/3)^(-4)xx3^(-1)xx1/6

Simplify : [ ((- 3 )/( 2) xx (4)/(5) ) + ((9)/(5) xx (-10)/( 3)) - ((1)/(2)xx (3)/(4)) ] div [ ((21)/( 9) xx (3)/(7)) +((7)/(8) xx (16)/(14)) ]