CxHyOz+____O2 (点燃)XCO2+____H2O

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CxHyOz+____O2 (点燃)XCO2+____H2O

x+y/4-z/2 y/2
CxHyOz+_x+y/4-z/2___O2 (点燃)XCO2+_ y/2_H2O

2个空分别填写 X+Y/4-z/2,Y/2

X+Y/4-z/2 Y/2