tá có: 8 < 2x < 29:24
=> 23 < 2x < 25
=> 3 < x < 5 Vì x là số nguyên dương nên x = 4
tá có: 8 < 2x < 29:24
=> 23 < 2x < 25
=> 3 < x < 5 Vì x là số nguyên dương nên x = 4
tim so nguyen duong x,y thoa man : x^2=1!+2!+3!+....+y!
Tim cac so nguyen duong x;y;z thoa man x!+y!=10.z+9
cho a,b,c,x,y,z la cac so nguyen duong thoa man a^x=bc;b^y=ac;c^z=ab. chung minh xyz-x-y-z=2
tim cap so nguyen x,y thoa man: |x+4|+|y-2|=3
tim tat ca cac so nguyen duong x,y thoa man : 2011x+7y=42231
tim cac so huu ti x y thoa man x+y va 1/x +1/y nguyen duong
cho x,y,z la cac so huu ti duong thoa man x+1/yz y +1/xz z+1/xy la cac so nguyen tim gia tri lon nhat cua bieu thuc A=x+y^2+z^3
tim x, y nguyen duong thoa man xy+ x- y = 4
1/tong cac gia tri nguyen cua x thoa man /x-0,2/<13
2/ti so gia A va B biet 2/7 cua A gap 4/9 lan 3/10 cua B