`a, 2x(x-3) = 2x^2 - 6x`.`
`b, (2x-5)x = 2x^2 - 5x`
`c, 1/2x(2x^2 +5)`
`= x^3 + 5/2x`
`d, -2x^3y(2x^2-3y+5yz) = -4x^5y + 6x^3y^2 - 10x^3y^2z`
`e, 2/3x^2y(3xy-x^2+y) = 2x^3y^2 - 2/3x^4y + 2/3x^2y^2`
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