Сократите дробь
1) m-3n/m^2-3mn
2) 3y+9/y^2-9
3) b^2-4/6+3b
4)x^2-9/3^2+x^3
5) x^2-8x+16/16-x^2
6) y^3+27/y^2-3y+9
7)20+10a+5a^2/a^3-8

1. =m-3n/m(m-3n)=1/m2.=3(y+3)/(y-3)(y+3)=3/y-33.= (b-2)(b+2)/3(b+2)=b-2/34.=не знаю5.= (x-4)^2/-(x-4)(x+4)=x-4/-x+46.= (y+3)(y^2-3y+9)/ (y^2-3y+9)=y+37.= 5(a^2+2a+4)/(a-2)(a^2+2a+4)=5/a-2