\[\boxed{\ \mathbf{416\ (416)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\angle ABC = 72^{0};\]
\[BD - биссектриса\ \angle ABC;\]
\[BE - биссектриса\ \angle ABD.\]
\[\angle CBE = \angle CBD + \angle DBE\]
\[\angle CBD = \angle ABC\ :2 = 72\ :2 =\]
\[= 36^{0}.\]
\[\angle DBE = \angle CBD\ :2 = 36\ :2 =\]
\[= 18^{0}.\]
\[\angle CBE = 36^{0} + 18^{0} = 54^{0}.\]
\[Ответ:54^{0}.\]