For any two integers, a "+" B = a + B-1, a "×" B = axb-1, Find the value of 4 "×" [(6 "+" 8) "+ (3" × "5)]

For any two integers, a "+" B = a + B-1, a "×" B = axb-1, Find the value of 4 "×" [(6 "+" 8) "+ (3" × "5)]

（6“＋”8）=6+8-1=13
（3“×”5）=3*5-1=14
13"+"14=13+14-1=26
4"x"26=4*26-1=103
So:
4“×”[（6“＋”8）“＋”（3“×”5）]=103

For integers a, B, C and D, the expression │ ABCD │ denotes the operation AC BD, and 1 is known

It can be seen from the meaning of the title:
│1b4c│=14－bc
And because a, B, C, D are integers
So 1

For the integer ABCD, define the operation ABCD = AC – BD, and find the value of 1234

For the integer ABCD, define the operation ABCD = AC – BD, find 1234 = 13-24 = - 11