Răspuns :
80 : 2 + ( 50 × 2 : 10 + 90) + 10 - 25 × 4= 50
= 40 + ( 100 : 10 + 90 ) + 10 - 100 =
= 40 + (10 + 90) + 10 - 100 =
= 40 + 100 + 10 - 100 =
= 150 - 100 =
= 50
= 40 + ( 100 : 10 + 90 ) + 10 - 100 =
= 40 + (10 + 90) + 10 - 100 =
= 40 + 100 + 10 - 100 =
= 150 - 100 =
= 50