C
conangcatinh711


c1:a,cho a la so nguyen duong sao cho a+1 va 2a+1 la cac so chinh phuong
b.giaiphuong trinh nghiem nguyen: x^2-2y^2=5
c2:cho x>=2;x+y>=3.tim Min cua bieu thuc :
P=x^2+y^2+1/x+1/(x+y)
b.giaiphuong trinh nghiem nguyen: x^2-2y^2=5
c2:cho x>=2;x+y>=3.tim Min cua bieu thuc :
P=x^2+y^2+1/x+1/(x+y)