Răspuns :
a : 2 => 10 : 2 = 5 , 20 : 2 = 10 , 30 : 2 = 15 , 40 : 2= 20
a : 5 => 10:5 = 2 , 20:5 = 4 , 30:5 = 6 , 40:5 = 8
a:10 => 10:10 = 1 , 20 :10 = 2 , 30:10 = 3 , 40:10 = 4
A=10;
A/2=10/2=5;
A/5=10/5=2;
A/10=10/10=1;
A=20;
A/2=20/2=10;
A/5=20/5=4;
A/10=20/10=2;
A=30;
A/2=30/2=15;
A/5=30/5=6;
A/10=30/10=2;
A=40;
A/2=40/2=20;
A/5=40/5=8;
A/10=40/10=4;