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bai 1 tim so tu nhien co 4 chu so ab cd biet abcd+abc+ab+a=4321.tim abcd
bai 2 cho m , n la cac so tu nhien va p la so nguyen to thoa man 9/m-1=m+n/p. tinh A= p^2-n
bai 3 tim so co 3 chu so biet abc 1000/a+b+c=abc.
tim so co 3 chu so abc biet b^2=ac va abc -cba=495
tim chu so a,b biet ab + ba chia het cho 3 va 4tim chu so a,b,c biet abc chia het cho 5 va 9,a + b = 2c
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tim so co 3 chu so biet abc:11=a+b+c
tim so tu nhien abc biet (a+b+c)3=abc va a,b,c la 3 chu so khac nhau
Tim cac chu so a,b,c,d biet a× bcd×abc=abcabc
tim cac chu so a;b;c;d biet
a *bcd*abc=abcabc
tim cac chu so a ,b, c,d khac nhau biet rang abc x c=dac
a)so sanh E=2018^99-1/2018^100-1 va F=2018^98/2018^99-1
b)Tim so nguyen to ab (a>b>0),biet ab-ba la so chinh phuong
c)Cho abc la so tu nhien co 3 chu so .Tim gia tri lon nhat cua A={abc/a+b+c}+1918