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Объяснение:
2.1 Отношение площадей подобных треугольников равно квадрату коэффициента подобия
S(CPK)/S(ABE)=k²
S(ABE)=S(CPK)/k²
A) S(ABE)=27/2²=6.75
Б) S(ABE)=27*3²/1=243
2.2 Средняя линия треугольника параллельна не пересекающейся с ней стороне треугольника и равна половине этой стороны.
BC=1/2*EA=1/2*9=4.5
Зачем даны ET и EB я не знаю.
3.1 Биссектриса угла треугольника делит противоположную сторону на части, пропорциональные прилежащим сторонам треугольника.
Из этого выводится уравнением формула (по идее её должны проходить), которая принимает вид для этого тр-ка такой:
CD=10-6.66=3.33
ну там они в периоде после запятой.
