Răspuns :
R ; 2 + M = 60
R + Mx2=120 ( sa inmult totul cu 2 )
R _____________________
M______________________ } 120
120:4=30 ( M)
30x2=60 ( R )
R + Mx2=120 ( sa inmult totul cu 2 )
R _____________________
M______________________ } 120
120:4=30 ( M)
30x2=60 ( R )
2+M=60
R+Mx2=120
R________________
M_______________ }120
120:4=30(Marw)
30x2=60(radu)
R+Mx2=120
R________________
M_______________ }120
120:4=30(Marw)
30x2=60(radu)