(1)m的平方-3m+2/m的平方-m,其中m=92 (2)3a的平方-ab/9a的平方-6ab+b的平方,其中a=-8,b=2

(1)
m^2-3m+2/m^2-m
=(m-2)(m-1)/m(m-1)
=(m-2)/m
=1-2/m
=1-2/92
=1-1/46
=45/46
(2)
3a^2-ab/9a^2-6ab+b^2
=a(3a-b)/(3a-b)^2
=a/(3a-b)
=-8/(3*(-8)-2)
=-8/-26
=4/13