Simplify :
`(-4) xx(-7) xx(-1)`

Simplify: (-4)xx(-2)^4

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

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

Simplify : (-5)/(9) xx ((-10)/(13)) xx ((21)/(11)) xx (-7)

Simplify : (3 xx 2)^4

Simplify : 7^(16)xx7^(5)xx((1)/(7))^(11)

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