(1)(a^3+1/5a^2b+3)-1/2(a^2b-6)
=a³+1/5a²b+3-1/2a²b+3
=a³+(1/5a²b-1/2a²b)+3+3
=a³-3/10a²b+6
(2)-3(1/2x^3-1/3y^3+1/6)+2(1/3x^3-1/2y3+1/4)
=-3/2x³+y³-1/2+2/3x³-y³+1/2
=(-3/2x³+2/3x³)+(y³-y³)-1/2+1/2
=0+0+0
=0
(1)(a^3+1/5a^2b+3)-1/2(a^2b-6)
=a³+1/5a²b+3-1/2a²b+3
=a³+(1/5a²b-1/2a²b)+3+3
=a³-3/10a²b+6
(2)-3(1/2x^3-1/3y^3+1/6)+2(1/3x^3-1/2y3+1/4)
=-3/2x³+y³-1/2+2/3x³-y³+1/2
=(-3/2x³+2/3x³)+(y³-y³)-1/2+1/2
=0+0+0
=0