Question

对于分式3x-n分之x+m,当x=3时,分式的值为0；当x=1时,分式无意义,求m-n分之2m+n

Answer 1

由题意得3*3-n≠0;3+m=0

1*3-n=0

解得n=3;m=-3

(2m+n)/(m-n)

=(-3)/(-6)

=1/2