a,b,c,d= numere necunoscute
S= a+b+c+d=?
------------------------- .
a=b-2174=4161-2174=1987
b=c+1119= 3042+1119=4161
c=13×d=234×13= 3042
d=3×78=234
a+b+c+d=1987+4161+3042+234=6148+3042+234=9190+234=9424
Răspuns: 9424
[tex]a+b+c+d\\\\a= b - 2174\\\\b = 1119 +c\\\\c = 13*d\\\\d = 3 * 78\Rightarrow \boxed{d=234}\\\\c = 13 * 234 \Rightarrow \boxed{c = 3042}\\\\b = 3042+1119 \Rightarrow \boxed{b =4161}\\\\ a = 4161 - 2174 \Rightarrow \boxed{a = 1987}\\\\a+b+c+d = 1987+4161+3042+234\\\\\boxed{a+b+c+d =9424}[/tex]
