cho x,y,z thuôc R thỏa mãn đk: x+y+z+xy+yz+xz=6. CMR:
x^2+y^2+z^2>=3
chứng minh rằng
Started By lechiduc712, 23-03-2014 - 21:23
#1
Posted 23-03-2014 - 21:23
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