сократите дробь: б)6a^2b/9ab, в)7m^3n^2/14m^2n^3, г)20xt^2-5yt^2/zt(4x-y), д)m^2-14m+49/m^2-49, е)5a-1/(1-5a)^2, ж)5a-1/(1-5a)^3, з)m^2-4/6m+12

Объяснение:

б)6a^2b/9ab=2b/3

в)7m^3n^2/14m^2n^3=m/2n

г)20xt^2-5yt^2/zt(4x-y)=5t^2(4x-y) : zt(4x-y)=

=5t/z

д)m^2-14m+49/m^2-49=(m-7)(m-7):(m-7)(m+7)=(m-7)/(m+7)

е)5a-1/(1-5a)^2=5a-1/(5a-1)(5a-1)=1/5a-1

ж)5a-1/(1-5a)^3=5a-1/(5a-1)(5a-1)(5a-1)=

=1/(5a-1)^2

з)m^2-4/6m+12=(m-2)(m+2)/6(m+2)=

=(m-2)/6