a)
1 900 - 23 x 46 + 147 + 45 = 1 034
----------
= 1 900 - 1 058 + 147 + 45=
-----------------
= 842 + 147 + 45=
--------------
= 989 + 45 =
------------
= 1 034
b)
38 x 24 + 42 x 15 - 35 - 123 x 5 = 927
--------- ---------- --------
= 912 + 630 - 615=
-------------
= 1 542 - 615 =
--------------
= 927
c)
2 900 - ( 270 + 44 x 50) + 24 x 16 = 814
---------- ----------
= 2 900 - ( 270 + 2 200 ) + 384=
-----------------
= 2 900 - 2 470 + 384 =
-----------------
= 430 + 384=
-----------
= 814