tim phan so co mau khac 1 biet rang tich cua tu va mau la 210 va no co the viet duoc duoi dang so thap phan huu han, co ..................... phan so thoa man
Tim x∈Z thoa man 33n+1=9n+2
Tim x∈Z thoa man 33n+1 = 9n+2
cap so tu nhien a, b thoa man (2018a+3b+1)x(2018a +2018a+b)=225
cho x, y la cac so nguyen duong sao cho A = x^4 + y^4 / 15 cung la so nguyen duong . cmr : x va y deu chia het cho 3 va 5 , tu do tim gtnn cua A
Tim n de bieu thuc sau la so nguyen : P = \(\dfrac{3n+2}{n-1}\)
tim cac cap so nguyen ( x ; y ) thoa man : xy - x - y = 2
chung minh rang moi so lon hon 3 deu co dang 6^n+_1
so nguyen a de 3/7-3a la so tu nhien a la
