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(1)-a•(6 a^2 -ab)∕(-3 a^2)
=(-6 a^3+a^2 b)/(-3a^2)
=2a-(1/3)b
(2)8x^3∕(-2x)^3-(2x^2-x)∕(1/2 x)
=8 x^3/[(-2)^3 x^3 ]- x*(2x-1)/(x/2)
= -1 - 2*(2x-1)
= -1 - 4x+2
=1-4x
(1)-a•(6 a^2 -ab)∕(-3 a^2)
= -a*a(6a-b)/(-3a^2)
=(6a-b)/3
(2)8x^3∕(-2x)^3-(2x^2-x)∕(1/2 x)
=(2x)^3/(-2x)^3 - x*(2x-1)/(x/2)
= -1 - 2*(2x-1)
= -1 - 4x+2
=1-4x