pp
将（x^2+(9/4)y^2+z^2-1)^3-x^2z^3-(9/80)y^2z^3=0 化为z=?的形式.小弟不胜受
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1:7x+2y-z=7 2:6x-y+z=7 3:4x+3y+z=9 1：9x+4y+z+10 2：-9X+2y+3z=
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x-2y+z=9 3x+2y-2z=4 2x-z=9
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x-2y+3z=0,3x+2y+5z=12,2x-4y-z=(-9)
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3x+2y+z=9,x+y+2z=0,2x+3y-z=11
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(1)3x+4y=15 2y-z=2 x+2z=9 (2) x+y+z=8 2x+3y-z=6 3x-y+z=8 (3)
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x-2y+z=9, 2x+y+3z=10, 3x+2y-4z=-3
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x+y-z=2 5x+2y-2z=9 3x-y-3z=4
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3x+2y+z=9 x-3y-2z=1 -x+4y+4z=5
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{x+y+z=0 4x+2y+z=3 9x+3y+z=6
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2x+y+3z=1,y-2z=4,3x+y=9