$Z:C_xH_y(COOH)_z$$C_xH_y(COOH)_z+(x+\frac{y+z}{4})O_2\rightarrow (x+z)CO_2+\frac{y+z}{2}H_2O$
$1 (x+0,25y+0,25z)$
$0,1 0,3$
$\Rightarrow x+0,25y+0,25z=3$
$*)x=0\Rightarrow y=0\Rightarrow z=12\Rightarrow $loại
$*)x=3\Rightarrow \begin{cases}y=0 \\ z=0 \end{cases}\Rightarrow $loại
$*)x=2\Rightarrow y+z=4\Rightarrow CH_2=CH-COOH ; HOOC-CH=CH-COOH$
$*)x=1\Rightarrow y+z=8\Rightarrow $loại vì $y+z\leq 2x+2$