Răspuns :
a) 4 x (3+2) = 4 x 5 = 20
b) 17 x (3+12-9) = 17 x 6 = 102
c) 31 x (4+1) = 31 x 5 = 155
d) 19 x (7+3-1+8) = 19 x 17 = 323
b) 17 x (3+12-9) = 17 x 6 = 102
c) 31 x (4+1) = 31 x 5 = 155
d) 19 x (7+3-1+8) = 19 x 17 = 323