co ton tai hay ko so nguyen a,b,c thoa man tat ca cac dieu kien sau abc + a = -625 , abc + b = -633 , abc + c = -597
tim cac so nguyen a;b;c thoa man dong thoi 3 dang thuc :a.b.c+a=2011;a.b.c+b=2013;a.b.c+c=2015
tim cac so nguyen a,b,c thoa man dong thoi 3 dang thuc
a*b*c+a=1333;a*b*c+b=1335;a*b*c+c=1341
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 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
Cho so nguyen a lon hon 32.hoi ton tai hay khong so tu nhien k thoa man a40<k<a41 ma k co it nhat 61 chu so 0 ở tan cung
Ton tai hay khong cac so nguyen a,b,c sao cho:
a.b.c.d+a=1999
a.b.c.d+b=999
a.b.c.d+c=99
a.b.c.d+d=9
Ton tai hay khong cac so nguyen a,b,c sao cho:
a.b.c.d+a=1999
a.b.c.d+b=999
a.b.c.d+c=99
a.b.c.d+d=9
moi nguoi giup toi voi........cho ket qua thoi nha
1. gia tri x+y+z biet :
lx-5l+ly-4l+lz-4l=0
2.so cac uoc nguyen duong cu 2^6.3^3
3.so cac uoc nguyen duong cua 18
4.so duong thang tao thanh boi 8 biem phan biet doi mot khong thang hang
5.so tu nhien n thoa man 2^n+1:4^2=1024
6.UCLL(12,18,24)
7.so tu nhien n thoa man 2+4+6.......+n=110
8.tim x 576.15:x=540
9.gia tri a+b+c biet
a+b=10,a+c=25,b+c=25
so phan tu cua tap hop A cac so le nho hon 23