2-5m-2n+5mn/10m^2-9m+2 Сократите дробь

Question

2-5m-2n+5mn/10m^2-9m+2 Сократите дробь

Answer 1

[2(1-n)-5m(1-n)]/5m-2)(2m-1)=(1-n)(2-5m)/(2m-2)(5m-1)=(n-1)/(2m-1)

10m²-9m+2=10(m-2/5)(m-1/2)=(5m-2)(2m-1)
D=81-80=1
m1=(9-1)/20=2/5
m2=(9+1)/20=1/2