Question

Rezolvați:
toate punctele de la exterior.10
plizzzzzz .dau coroană

Answer 1

a) ab+bc+ca=10a+b+10b+c+10c+a=11a+11b+11c=11 ⇒ 11(a+b+c)=88  a+b+c=88:11=8

b) 11(a+b+c)=abc  a+b+c=abc/11

c) 100a+10b+c+100c+10a+b+100b+10c+a=777 ⇒  111a+111b+111c=777  111(a+b+c)=777  a+b+c=7

d) 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