Simplify each of the following: `2x-{5y-(x-2y)}` `2x-[3y-{2x-(y-x)}]`

Simplify the following: -x+y+z-(2x-3y+z)

Simplify the following (x-y) (x-2y)

Simplify the following (2x - 3y ) (4x - 5y)

5.Simplify : 2x-[3y-{2x-(y-x)}]

Simplify the following (2x - 3y) (2x+3y)

Simplify each of the following: (4x+2y)^(2)+(4x-2y)^(2)(4x+2y)^(3)-(4x-2y)^(2)

Simplify the following : (x-y)(2y-x)+(x+y)(x-y)-(y-3x)(2x-3y)

Simplify each of the following expressions: x^(2)(1-3y^(2))+x(xy^(2)-2x)-3y(y-4x^(2)y)

Simplify the following:(x-2y) (y-3x)+(x+y) (x-3y)- (y-3x)(4x-5y).

Assuming that x,y,z are positive real numbers,simplify each of the following: (sqrt(x^(-3)))^(5) (ii) sqrt(x^(3)y^(-2))( iii) (x^(-(2)/(3))y^(-(1)/(2)))^(2)