Răspuns:
20 - ( 3 × 5 - 2 + 3 ) : ( 26 - 9× 2 ) = 18
20 - ( 15 - 2 + 3 ) : ( 26 - 18 ) =
20 - ( 13 + 3 ) : ( 26 - 18 ) =
20 - 16 : 8 =
20 - 2 = 18
19 + ( 6 × 7 - 18 ) - 2 × 13 = 17
19 + ( 42 - 18 ) - 2 × 13 =
19 + 24 - 2 × 13 =
19 + 24 - 26 =
43 - 26 = 17
48 + ( 103 - 100 ) × 9 + ( 24 : 3 × 0 ) = 75
48 + 3 × 9 + ( 8 × 0 ) =
48 + 3 × 9 + 0 =
48 + 27 + 0 =
75 + 0 = 75