Operaciones combinadas.

4 + 5 x 3 = 19
(6 - 2) x 4 = 16.
(4 x 2) - (2 x 3) = 2.
( 4 x 3 + 2 ) x 5 = 70.
(14 - 2 x 3) - (3 x 2 - 3) = 5.
(17 - 3 x 3) : = 4.
4 + 30 -  6 x 5 + 4 x 3 = 16.
(6 : 3) x (4 + 2) = 12.
(7 - 2 x 3) x 4 + 5 = 135.
( 4 - 2 x 2) + (3 + 3 x 2) = 12.