Question

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

Comments

Tìm x, y , z ak bn

Answer 1

=> x(x+y+z)+y(x+y+z)+z(x+y+z)=-12+18+30=36

=>(x+y+z)(x+y+z)=36

=>(x+y+z)^2=36

=>x+y+z=6

hoac x+y+z=-6

TH1:x+y+z=6

=>x(x+y+z)=6x=-12=>x=-2

tuong tu,ta co: y=3; z=5

TH2: x+y+z= -6

=>x=2; y=-3; z=-5

 

Comments

Sai rồi bạn !!!!! Tiếc quá nhưng bạn sai rồi

Answer 2

Tìm x,y,z nhá