a) ( 7 503:61+877):500+53x11
= (123+877):500+53x11
= 1000:500+53x11
= 2+ 583
= 585
b)207x9-(19^2+3^2):74+2296:41
= 1863-(361+9):74+56
= 1863-370:74+56
= 1863-5+56
= 1858+56
= 1914
c)5x230-7x(512:32+2^2)+4687:43
= 1150-7x(16+4)+109
= 1150-7x20+109
= 1150-140+109
= 1010+109
= 1119
d)[493:17-(128:2^3+224:8):22]:27-1
= [ 493:17-(128:8+224:8):22]:27-1
= [ 493:17-(16+28):22]:27-1
= ( 493:17-44:22):27-1
= ( 29-2):27-1
= 27:27-1
= 1-1
= 0
