206abc : 501 = abc
abc x 501 = 206abc
206000 + abc = abc x 501
206000 = abc x 500
abc = 412
206abc : 501 = abc
abc x 501 = 206abc
206000 + abc = abc x 501
206000 = abc x 500
abc = 412
minh can cach lan
ai nhanh minh tk
cac ban lam gappp giup minh nhe
thay cac chu so a,b,c boi cac so thich hop de so A=\(\overline{579abc}\)\(chiahetcho5,7,9\)
Thay cac chu so a,b,c boi ca chu so thich hop de so A= 579abc chia het cho ca ba so 5;7;9
thay*boi cac chu so thich hop duoi dang hop so.
a. 3*
b. 7*
thay cac dau * boi cac chu so thich hop de:*1994* chia het cho 99
Thay cac chu boi so thich hop, cac chu so abc deu giong nhau
abc
+
acb
=
bca
a, phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111.
b, thay dau * boi chu so thich hop:
** . * =111
thay dau x boi cac so thich hop de cac so sau day la cac so nguyen to 12x ; 36x
cac dau *va cac chu boi cac chu so thich hop
a,*8*3x9=70*7*
cho so 155*710*4*16 co 12 chu so .chung minh rang neu thay cac dau * boi cac chu so khac nhau trong ba chu so 1,2,3 mot cach tuy y thi so do luon chia het cho 396