Răspuns :
[15x(17-16)x2-15]x 4-10
(15x1x2-15)x4-10
(15x2-15)x4-10
(30-15)x4-10
15x4-10
60-10 = 50
(15x1x2-15)x4-10
(15x2-15)x4-10
(30-15)x4-10
15x4-10
60-10 = 50
((15*(17-16)*2-15))*4-10
((15*1*2-15))*4-10
((30-15))*4-10
15*4-10
60-10
50
((15*1*2-15))*4-10
((30-15))*4-10
15*4-10
60-10
50