C(s)+H2O(l)=CO(g)+H2(g);△H1=+175.3kJ•mol﹣1
2CO(g)+O2(g)=CO2(g);△H2=﹣566.0kJ•mol﹣1
2H2(g)+O2(g)=2H2O(l);△H3=﹣571.6kJ•mol﹣1.
方程x(x﹣4)=0的解是____.