Question

Tìm x, y, z biết x (x + y + z) = - 5; y (x + y + z) = 9; 7 (x + y + z) = 5

Answer 1

Explanation:

Tim xyz. x (x+y+z) = -12 ;y (x+y+z) = 18 ;z (x+y+z) = 30