`3)C=(4x²-8xy)/[5(2y-x)³]`
`=[4x(x-2y)]/[5(2y-x)³]`
`=[-4x(2y-x)]/[5(2y-x)³]`
`=(-4x)/[5(2y-x)²]`
`6)F=(4x²+16x)/(x²+3x-4)`
`=[4x(x+4)]/(x²+4x-x-4)`
`=[4x(x+4)]/[x(x+4)-(x+4)]`
`=[4x(x+4)]/[(x+4)(x-1)]`
`=(4x)/(x-1)`
`7)G=(x²+2x)/(x²-4)`
`=[x(x+2)]/[(x+2)(x-2)]`
`=x/(x-2)`
`8)H=(4x-4y)/(x²-y²)`
`=[4(x-y)]/[(x+y)(x-y)]`
`=4/(x+y)`