👤

determinati a + b +c astfel cat ab+bc+ca=88 , ab +bc + ca =abc , abc+ cab+ bca =777 si ab + ac+ ba +bc +ca + cb =110

Răspuns :

inteleg ca sunt nr de forma adica bara deasupra
1) ab+bc+ca=10a+b+10b+c+10c+a=11a+11b+11c=11(a+b+c)
11(a+b+c)=88  a+b+c=88:11=8
2) 11(a+b+c)=abc  a+b+c=abc/11
3)100a+10b+c+100c+10a+b+100b+10c+a=777
   111a+111b+111c=777  111(a+b+c)=777  a+b+c=7
4) 10a+b+10a+c+10b+a+10b+c+10c+a+10c+b=110
    22a+22b+22c=110  22(a+b+c)=110  a+b+c=110:22=5