CMR: Neu so abc (ke dau) la so nguyen to thi b2-4ac khong phai la so chinh phuong
cmr da thuc sau khong co nghiem : \(x^{10}-x^5+x^2-x+1\)
mot doi van nghe khoi 7 gom 10 ban trong do co 4 ban nam va 6 ban nu. De chao mung ngay 30/4can 1 tiet muc van nghe co 2 nam va 2 nu.Hoi co nhieu nhat bao nhieu cach lua chon de co 4 ban nhu tren tham gia
1 xe may di tu a den b voi van toc v mat 6h. hoi xe may do di 3/4 quang duong ab voi van toc khong thay doi thi mat bao nhieu thoi gian?
1.tim so nguyen to p de 4p+1 la so chinh phuong
2.chung minh rang khong co gia tri x, y nguyen nao thoa man
7x^2- 5y^2=3
Tim cac so x, y, z biet : 2x-2 .3y-3 .5z-1 =144.
Xin loi vi khong viet dau duoc, cac ban co gang giup me lam nhanh nhe, me dang can gap
So sanh khong quy dong:
\(\dfrac{5}{-12}\) va \(\dfrac{-6}{17}\)
Help me now!!!
So sanh 2 phan so sau khong quy dong...
\(\frac{5}{-12}\) va \(\frac{-6}{17}\)
Cho a,b thuoc N
thoa 2a2 +a = 3b2 +b
CM: a-b va 2a+ 2b +1 CP
khong danh dau dc mong mn thong cam