а) b+3a|18a^2b + a-4b|24ab^2=(4b(b+3a)+3a(a-4b))/72a^2b^2=(4b^2+12ab+3a^2-12ab)/72a^2b^2=(4b^2+3a^2)/72a^2b^2
б) m-4|m - m-3|m+1=((m+1)(m-4)-m(m-3))/m(m+1)=(m^2+m-4m-4-m^2+3m)/m^2+m=0/m2+m=0
в) y+3|4y(y-3) - y-3|4y(y+3)=((y+3)(y+3)-(y-3)(y-3))/4y(y-3)(y+3)=(y^2+6y+9-y^2+6y-9)/4y(y^2-9)=12y/4y(y^2-9)=3/(y^2-9)
г) a-5|5a+25 + 3a+5|a^2+5a=a-5|5(a+5)+
3a+5|a(а+5)=(а(а-5)+5(3а+5))/5а(а+5)=(a^2-5a+15a+25)/5а(а+5)=(a^2+10a+25)/5а(а+5)=(а+5)^2/5а(а+5)=(а+5)/5а