-2(3x + 2) = 12 + 22 + 32
\(\Rightarrow\)-2(3x + 2) = 1 + 4 + 9
\(\Rightarrow\)-2(3x + 2) = 14
\(\Rightarrow\) 3x + 2 = -7
\(\Rightarrow\) 3x = -9
\(\Rightarrow\) x = -3
tim so nguyen x thoa man : -210=(-1)+(-2)+(-3)+...+(-x-1)+(-x)
tim so nguyen x thoa man -210=(-1)+(-2)+(-3)+...+(-x+1)+(-x)
tim so nguyen x thoa man -210=-1+-2+-3+...+(-x-1)+-x la
tim so nguyen x , y thoa man : x - 2.x.y + 3.y = 1
tim so nguyen x thoa man :
-210=(-1)+(-2)+(-3)+...+(-x+1)+(-x)
tim cac so nguyen to x, y thoa man: (x - 2)2(y - 3)= -4
tim so nguyen x, y thoa man : 3.x.y + x =2.y
tim so nguyen x, y thoa man : 3.x.y + x =2.y
bai 1 28(30-48)-30(28-38)
bai 2 :tim cac cap so nguyen (x:y)thoa man : y+3+x.y+3x=7
