Question

Ofer coroana si 30 puncte.

Maria,Radu si Andrei au comfectionat ilustratii.
Maria si Radu au impreuna 125 ilustratii,Radu si Andrei 131 ilustratii,iar Maria si Andrei 140 ilustratii.
Cate ilustratii are fiecare copil? Sfat:Prin metoda figurativa,desen

Answer 1

M+R=125 ilustrate
R+A=131 ilustrate
M+A=140 ilustrate
2(M+R+A)=125+131+140
2(M+R+A)=396
M+R+A=396:2
M+R+A=198
125+A=198
A=198-125
A=73  ilustrate
R+A=131
R+73=131
R=131-73
R=58 ilustrate
M+R=125
M+58=125
M=125-58
M=67
PROBA
M+R=67+58=125
R+A=58+73=131
M+A=67+73=140