Question

Aflati numerele naturale de forma abc cu bara,stiind ca abc cu bara-ab cu bara-c=486

Answer 1

100a +10b+c -10a -b-c =486
90a +9b=486
9( 10a+b)= 486
10a+b = 54
 
a=5
b=4
c=0

deci avem: 540- 54-0= 486

Answer 2

abc-ab-c=486
100a+10b+c-10a-b-c=486
90a+9b=486
9(10a+b)=486
10a+b=54
a=1→b=44(fals)
a=2→b=34(fals)
a=3→b=24(fals)
a=4→b=14(fals)
a=5→b=4(singura varianta)
c=0,1,2,3,4,5,6,7,8,9
numerele sunt:540,541,542,543,544,545,546,547,548,549