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Số lớn nhất trong các số 459 495; 459 549; 549 954 và 549 945 là 549 954.
Chọn C.
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Câu 1 : A = 11 ; B = 77 . Chia hết cho 1 ; 2 ; 4 ; 8 ; 11 ; 22 ; 44 ; 88 .
Câu 2) D = 9
a) ab = 10a + b
b) abc = 100a + 10b + c
c) aabb = 1100a + 11b
gọi số đó là ab và cd (ab >cd)
ta có :
abcd - cdab = 495
(ab . 100 + cd) - (cd . 100 + ab) = 495
ab.100 + cd - cd . 100 - ab = 495
(ab .100 - ab) - (cd . 100 - cd) = 495
ab . 99 - cd . 99 = 495
99 . ( ab - cd) = 495
ab -cd = 495 : 99
ab - cd = 5
ab là :
(103 + 5 ) : 2 = 54
cd là :
103 - 54 = 49
ĐS.....................................
abcd + dcba = 15664
1000*a+100*b+10*c+d+1000*d+100*c+10*b+a=15664
1001*(a+d)+110*(b+c)=15664
Mà 110*(b+c) có tận cùng là 0
Nên 1001*(a+d) có tận cùng là 4
Nên a + d có tận cùng là 4
1001 * 4 = 4004 ( loại )
1001 * 14 = 14014 ( nhận )
Vậy a+c=14
Vậy a = 9 ; d = 5
14014+110*(b+c)=15664
110*(b+c)=1650
b+c=1650:110
b+c=15
Vậy a + b + c + d = 14 + 15 = 29
B
mik đang cần ak