phuong trinh : mx.x+2x+m.m-5.m+2=0 co nghiem la x=1 thi m =?
cho phuong trinh 2(x^2+m+1)=(1-m)(1+m) <an x>. voi =? thi phuong trinh luon co nghiem
co ghi cach giai
1 . tong binh phuong tat ca cac nghiem cua phuong trinh : x4(x-1)+(x-1)x3=0
2.neu da thuc 2m3-m+n co 2 nhan tu la : x+2 va x-1 thi gia tri cua 2m+3n la
3.tong x; y thoa man (x-2015)2+(y-2014)4>hoac bang 0 la ?
tim nghiem nguyen cua phuong trinh
3x^2+5y^2=345
Cho đa thức: f(x)= x^2+bx+c
Cm: neu 1+b+c=0 thi f(x) co 1 nghiem la 1
tim phan so co dong thoi cac tinh chat sau
a/Tu cua phan so la so tu nhien co mot chu so
b/Hieu giua tu so va mau so la 4
c/Neu giu nguyen tu so va viet them vao ben phai mau so mot chu so dung bang tu so,thi duoc phan so moi bang phan so 1/5
Cho phuong trinh (2x-m) / (x-2) + (x-1) / (x+2) = 3. Tim m de phuong trinh co nghiem duong.
Cho phuong trinh x3 +kx2 -4x -4=0
a) Xac dinh k de phuong trinh co 1 nghiem x=1
b) Voi gia tri k vua tim duoc, tim cac nghiem cua phuong trinh
Giai toan bang cach lap phuong trinh :
So lua o kho thu nhat gap doi so lua o kho thu hai . Neu bot o kho thu nhat di 750 ta va them vao thu hai 350 ta thi so lua o 2 kho se bang nhau . Tinh xem luc dau moi kho co bao nhieu lua.