分式的加减m/m^2-n^2-n/m^2-n^2a^2/a^2-b^2-a^2/b^2+2ab/a^2-b^22x^2/x-y-x^2-4xy/y-x+2y^2-x^2/x-y3/2x+4-6/4-x^2+9/2x-4

Question

分式的加减
m/m^2-n^2-n/m^2-n^2
a^2/a^2-b^2-a^2/b^2+2ab/a^2-b^2
2x^2/x-y-x^2-4xy/y-x+2y^2-x^2/x-y
3/2x+4-6/4-x^2+9/2x-4

Answer 1

m/m^2-n^2-n/m^2-n^2=(m-n)/m^2-2n^2a^2/a^2-b^2-a^2/b^2+2ab/a^2-b^2=1-2b^2-a^2/b^2+2b/a2x^2/x-y-x^2-4xy/y-x+2y^2-x^2/x-y=x-y-x^2-4x-x+2y^2-y=2y^2-4x-x^2-2y3/2x+4-6/4-x^2+9/2x-4=1/4(6x-6-4x^2+18x)=1/4(-6...