Răspuns :
138+(9-1)×2:8-2×(100-13)×2=138+8×2:8-2×87×2=138+16:8-174×2=138+2-348=140-348=208
138+(9-1)×2÷8-2×(100-9)×2=
138+8×2÷8-2×91×2=
138+16÷8-182×2=
138+2-364=
138+362=50
138+8×2÷8-2×91×2=
138+16÷8-182×2=
138+2-364=
138+362=50