АВ+ВС=11см
x2-xy/18x*6x/x-y=(х2-ху)6х : 18х(х-у)=
=х(х-у)6х : 18х(х-у)= х/3
x=6,9;y=-9,3
х/3=6,9/3=2,3
<span>729a^3b^9-64x^9y^18==</span>