B
boykho96_hanam


1. tim 3 so tu nhien x,y,z tm:
1/x+1/y+1/z+1/xyz=1
2.phuong phap tinh:
can<2+can<2+can<2+.....+can2>
1/x+1/y+1/z+1/xyz=1
2.phuong phap tinh:
can<2+can<2+can<2+.....+can2>