chứng minh rằng 10x2 - 10y2 - z2 = 0 thì (7x -3y +2z )(7x - 3y - 2z) = (3x - 7y)2
chứng minh rằng 10x2 - 10y2 - z2 = 0 thì ( 7x - 3y + 2z )( 7x - 3y -2z ) = ( 3x - 7y )2
Cho x2=y2+t2
Chứng minh (5x-3y+4t)(5x-3y-4t)=(3x-5y)2
Cho 10x2=10y2+t2
Chứng minh (7x-3y+2t)(7x-3y-2t)=(3x-7y)2
Cho 10x² = 10y² + z²
Chứng minh rằng: (7x - 3y +2z)(7x - 3y - 2z) = (3x - 7y)²
cho x^2-y^2-z^2=0 chứng minh rằng: (5x-3y+4z)*(5x-3y-4z)=(3x-5y)^2
cmr 10x^2 - 10y^2 - z^2 = 0 thi (7x-3y+2z)(7x-3y-2z) = (3x-7y)^2
Nếu x2=y2+z2. chứng minh rằng (5x-3y+4z)(5x-3y-4z)=(3x-5y)2
chứng minh rằng : (5x-3y+4z)(5x- 3y-4z)=(3x-5y)2 nếu x2=y2+z2
Cmr : 10x2 - 10y2 - z2 = 0 thi
( 7x - 3y + 2z ) ( 7x - 3y - 2z ) = ( 3x - 7y )2