8.若(z-3x)2+|y-2z|=0,那么代数式x+2y+z等于[ ] A.5x B.9x C.12x D.16x
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8.若(z-3x)2+|y-2z|=0,那么代数式x+2y+z等于[ ] A.5x B.9x C.12x D.16x
8.若(z-3x)2+|y-2z|=0,那么代数式x+2y+z等于[ ] A.5x B.9x C.12x D.16x
8.若(z-3x)2+|y-2z|=0,那么代数式x+2y+z等于[ ] A.5x B.9x C.12x D.16x
若(z-3x)2+|y-2z|=0
z-3x=0
y=2z
z=3x
y=2z=6x
所以
x+2y+z=x+12x+3x=16x
选D
D.16x
(z-3x)2+|y-2z|=0
(z-3x)2=0,|y-2z|=0
z=3x,
y=2z=2*3x=6x
x+2y+z
=x+2*6x+3x
=4x+12x
=16x
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