126
30
40
8 x ( 4 x 3 - 9) + 5 =
12 + 4 x ( 2 x 3 + 1) =
40 + [ 15 + ( 12-7 ) x 3 ] - 9 =
{ 9 + [ 10 + ( 6 + 3 x 5 ) ] } : 2 =
20
61
6 x [ 2 + ( 7 x 4 - 9) ] =
29
24 + ( 4 x 9 - 30) =
