Question

(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

Answer 1

(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