Question

repede, vă rog, am nevoie urgent ​

Answer 1

Răspuns:

QP=ab/(a+b)

Explicație pas cu pas:

ΔBQP≈ΔBDA⇒PQ/a=QB/AB

ΔAQP≈ΔABC⇒PQ/b=AQ/AB=(QB-QB)/AB=1-QB/AB

QB/AB=1-PQ/b=PQ/a

1=PQ/b+PQ/a

PQ(1/b+1/a)=1

PQ=1/(1/a+1/b)=1/((a+b)/ab)=ab/(a+b)