tổng+ hiệu) :2
tổng - hiệu) :2
tổng+ hiệu) :2
tổng - hiệu) :2
cho hai so a va b thoa man:a-b=2(a+b)=a/b
tim cac so nguyen duong a,b,c thoa man a+b+c=91 va b^2=a*c
tim 3 so nguyen a,b,c thoa man :
a + b = -4 ; b + c = -6 ; c + a = 12
tim 3 so nguyen a,b,c thoa man
a+b=-4 , b+cc=-6 ,a+c=12
Tim x,a,b nguyen duong thoa man :x+4=3^a va 4x+7=3^b
Tim cac cap so nguyen x,y thoa man
a) xy-5x+y=17
b) x.(y-2)=3 va x>y
Tim 3 so nguyen a, b, c thoa man : a+b=-4 ; b+c=-6 ; c+a=12.
Giai can ke tung chi tiet thi tui moi tick cho.
cho 3 so a,b,c la so nguyen . Trong do co 1 so nguyen am , 1 so nguyen duong va 1 so bang 0 , thoa man IaI=b^2.(b-c) . Hoi a,b,c thuoc loai so nao
tim so nguyen to p sao cho:
a,p+2 va p+4 la so nguyen to
b,p+2 va p+6 va p+8 la so nguyen to
c,p+10 va p+14 la so nguyen to