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1.9) Tr s BCDB 9 ca mt s thp phn: c xc nh bng cch ly 9 tr cho tng ch s thp phn. V d: B 9 ca 37 = 99 37 = 62 B 9 ca 419 = 999 419 = 580
Tr 2 s BCD (A B) c thc hin theo quy tc nh sau: (i) (ii) (iii) (iv) A + [b 9 ca B] Nu decade no > 9, th hiu nh bng cch cng 0110b. Nu c nh decade c trng s cao nht, th kt qu l s dng cng bit nh vo kt qu c kt qu sau cng. Nu khng c nh decade c trng s cao nht, th kt qu l s m ly b 9 c kt qu sau cng.
V d: Thc hin php tr 2 s BCD8d -3d 5d 8 +6 1000 + 0110 1110 0110 1 0100 1 0101 QT (i) QT (ii) QT (iii) 5d
75d -49d 26d
75 +50
0111 +0101 1100 0110 1 0010
0101 0000 0101 .... 0101 1 0010 0110
QT (i) QT (ii) QT (iii) 26d
86d -38d 48d
86 +61
1000 +0110 1110 0110 1 0100
0110 0001 0111 .... 0111 1 0100 1000
QT (i) QT (ii) QT (iii) 48d
28d -57d -29d
28 +42
0010 1000 +0100 0010 0110 1011 0110 0111 0001 B-9 (71)
QT (i) QT (ii) QT (iv) -29d
39d -87d -48d
39 +12
0011 1001 +0001 0010 0100 1011 0110 0101 0001 B-9 (51)
QT (i) QT (ii) QT (iv) -48d
35d -67d -32d
35 +32
0011 +0011 0110 B-9
0101 0010 0111 (67)
QT (i) -32d