anh chi oi giup em bai ne gap lem do!

D

daovuquang

bz-cy/a=cx-az/b=ay-bx/c
<=>(bz-cy)a/a^2=(cx-az)b/b^2=(ay-bx)c/c^2
<=>abz-acy/a^2=bcx-abz/b^2=acy-bcx/c^2=abz-acy+bcx-abz+acy-bcx/a^2+b^2+c^2=0/a^2+b^2+c^2=0
<=>abz-acy=bcx-abz=acy-bcx=0
<=>abz=acy=bcx
<=>bz=cy và ay=bx
<=>b/y=c/z và a/x=b/y
<=>a/x=b/y=c/z(đpcm)
Nhớ thanks.
 
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