=>3(1+2+3+4+.........+x)=3190
=>1+2+3+4+.......+x=190
=>\(\frac{x.\left(x+1\right)}{2}\)=190
=>x.(x+1)=190.2=380
=>x=19
19
Tik cho mk nha..........cảm ơn rất nhiều
gia tri nguyen cua x thoa man (3x-4)^5=(3x-4)^7
tap hop cac gia tri nguyen x thoa man |3x-4|=|x+2|
Tap hop cac gia tri nguyen cua x thoa man 3x-4=x+2
cho ham so 2 bien f(x,y) = x^3 +17x +36y ton tai hay khong so nguyen so nguyen x,y thoa man f(x,y) = 2018^2018
so cac cap so nguyen x;y thoa man x+y+x*y = 3
ki hieu [x] la so nguyen lon nhat khong vuot qua x .So nguyen x thoa man [7x-5/3]=-2
so nguyen x thoa man (x+x2)<0
Tim 3 so nguyen to lien tiep x,y,z (x<y<z) thoa man A = x^2 + y^2 + z^2 la so nguyen to
tap hop cac gia tri nguyen cua x thoa man |3x -4|=|x+2|
ki hieu [x] la so nguyen lon nhat khong vuot qua x .So nguyen x thoa man [7x-5/3]=-2
minh can gap dang thi cap truong
