a+b+c+d= 947
a = 77
B+c+d = 947-77=870
B /......./
c /......../...+2 /
d /.........../.....+2/......+2/ } 870
3 parti + 2+2+2=870
3 parti = 870-6=864
1 parte = 864:3=288
b = 288
c = 288+2=290
d = 290+2=292
proba : a+b+c+d =77+288+290+292=947
SUCCES LA SCOALA ❤