Question

KL+LK=165
KL-LK=27
K×L=?
Решите пожалуйста

Answer 1

$\left \{ {{KL+LK=165} \atop {KL-LK=27}} \right. \left \{ {{KL=LK+27} \atop {LK+27+LK=165}} \right. \left \{ {{KL=LK+27} \atop {2LK=138}} \right. \left \{ {{LK=69} \atop {KL=69+27}} \right. \left \{ {{LK=69} \atop {KL=96}} \right.$

KL=96;  LK=69

 то есть К=9, а L=6
K*L=9*6=54