Cho phuong trinh: \(3x^2-\left(3m-2\right)x-\left(3m+1\right)=0\)
Tim m de 2 ng x1,x2 thoa man he thuc \(3x_1-5x_2=6\)
1) tim m de pt \(x^2-2\left(m+1\right)x+6m-4=0\)co 2 nghiem x1;x2 thoa man \(\left(2m-2\right)x_1+x_2^2-4x_2=4\)
1) tim m de pt co 2 nghiem x1;x2 thoa man
2. cho phương trình: 2\(x^2-2mx+m^2-2=0\) (1), với m là tham số.
a) giải phương trình (1) khi m=2
b) tim cac gia tri cua m de phuong trinh co 2 nghiem \(x_1,x_2\)thoa man he thuc: A= |\(2x_1x_2-x_1-x_2-4\)| max
cho cac phuong trinh x^2 +(2m-1)x+m^2-2m=0
tim m de phuong trinh co hai nghiem trai dau
Cho he phuong trinh
\(\left(a+1\right)x-ay=5\) (1)
\(x+ay=a^2+4a\) (2)
Tim gia tri cua a thuoc Z sao cho he phuong trinh co nghiem (x;y) voi x, y thuoc Z
Cho 3 so x, y, z thoa man cac he thuc: \(\left(z-1\right)x-y=1\) va \(x+zy=2\)
Chmr: \(\left(2x-y\right)\left(z^2-z+1\right)=7\) va tim tat ca cac so nguyen x, y, z thoa man cac he thuc tren.
cho phuong trinh \(x^2-2x+m^2-2m+1=0\left(1\right)\) voi m la tham so
a/ Giai phuong trinh (1) khi m=\(\sqrt{2}\)
b/Chung minh rang neu phuong trinh (1) co 2 nghiem \(x_1,x_2\) thi \(\left|x_2-x_1\right|\le2\)
goi \(x_1,x_2\) la cac nghiem cua phuong trinh :
12\(x^2-6mx+m^2-4+\dfrac{12}{m^2}=0\left(m>0\right)\)
Tim m de A=\(x_1^3+x_2^3\) dat gia tri lon nhat , gia tri nho nhat