This is the 2109th most frequent Spanish word.
complejas
Complex.
The word 'complejas' is used as an adjective describing the equations, indicating their level of difficulty or intricacy.
Las ecuaciones que resolvemos hoy son muy complejas.
The equations we are solving today are very complex.
Here, 'complejas' refers to the intricate or elaborate characteristics of the artistic shapes.
Esas obras artísticas tienen formas complejas y colores vivos.
Those artistic works have complex shapes and vivid colors.
In this instance, 'complejas' describes the possible challenging or complicated nature of family situations.