①4a-3(2a-4)+(5a-8)=4a-6a+12+5a-8=3a+4
②-(6m-n)+2(m+n)=-6m+n+2m+2n=3n-4m
③2(x-3y)-(x+y)= 2x-6y-x-y = x-7y
④-6a²b-(-4a²b+ab)=-6a²b+4a²b-ab=-2a²b-ab
⑤(4x-2y²)-(2x+4y²)-3(x-3y²)=4x-2y²-2x-4y²-3x+9y²=-x+3y²
①4a-3(2a-4)+(5a-8)=4a-6a+12+5a-8=3a+4
②-(6m-n)+2(m+n)=-6m+n+2m+2n=3n-4m
③2(x-3y)-(x+y)= 2x-6y-x-y = x-7y
④-6a²b-(-4a²b+ab)=-6a²b+4a²b-ab=-2a²b-ab
⑤(4x-2y²)-(2x+4y²)-3(x-3y²)=4x-2y²-2x-4y²-3x+9y²=-x+3y²