1、12a^2(b-a)^2/27(a-b)^3
=12a^2(a-b)^2/27(a-b)^3
=4a^2/9(a-b)
2、m^2-4m/16-m^2
=m(m-4)/[-(m+4)(m-4)]
=-m/(m+4)
3、x^2-4x+4/x-2
=(x-2)²/(x-2)
=x-2
1、12a^2(b-a)^2/27(a-b)^3
=12a^2(a-b)^2/27(a-b)^3
=4a^2/9(a-b)
2、m^2-4m/16-m^2
=m(m-4)/[-(m+4)(m-4)]
=-m/(m+4)
3、x^2-4x+4/x-2
=(x-2)²/(x-2)
=x-2