280 - 3 x 7+4x0=
349 + 4 x 9+2x5=
520 +100: 10-6 x 12 + 36 : 4 =
(355) x (45:9) + (72:8) =
(24 :6 : 4) + (63: 7) + (14 x 2 x 6) - (9 x 8) =
(7 x 7) + (7 +79) + (7-7) + (7 : 7) =
(4 x 11) + (4 x 22) - (6 x 8-21) + (145 + 42: 6) =
(84 - 8 x 8): 5+ (3 x 6:2 + 17 x 5) =
