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tim cac chu so a,b,c khac 0 thoa man:abbc=ab x ac x 7
1.tinh
C=(1+1/1.3)(1+1/2.4)(1+1/3.5)...(1+1/2014.2016)
2.
a, so 2^100 viet trong he thap phan co bao nhieu chu so
b,Chung to rang neu p la so nguyen to lon hon 3 thi p^2 -1 chia het cho 3
3.
a,tim cac chu so a,b,c khac 0 thoa man
abbc=ab.ac.7
b,cho A=1/2.(7^2012^2014-3^92^94). chung minh A la so tu nhien chia het cho 5.
4.
a,chung minh rang ,neu
(ab+cd+eg) chia het cho 11 thi abcdeg chia het cho 11
b,chung minh rang
10^28+8 chia het cho 72
Cac ban nho ai nhanh mink tick nhung phai co du cach lam va loi giai !!!!!!!!!!!!!!!!!!!!!!!!!
tim a b c >0 biet abbc=ab.ac .7
Tim tat ca cac chu so a,b,c thoa man: abc-cba=6b3
ai tra loi dung minh kick cho nho giai ra nhe
tim so tu nhien co hai chu so thoa man ba dieu kien sau.tong cac chu so cua no khong nho hon 7 tong binh phuong cac chu so khong lon hon 30.hai lan so duoc viet boi cac chu so cua so phai tim theo thu tu nguoc lai khong lon hon so do
tim tat ca cac so co 2 chu so xy thoa man so A chia het cho 37 voi A=100..00(2009 chu so 0) 100..00(2011 chu so 0) xy
Tim cac so tu nhien a,b,c thoa man :2011a+2004b+2007c=20132014
Tim stn a chia 29 du 5 , chia 31 du 28
a . Tim stn a nho nhat thoa man db
b. So do chia 889 du may
c . Tim cac so tu 2000 - 3000 thoa man db
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.
