①CO(g)+2H2(g)⇌CH3OH(g)△H1=﹣99kJ•mol﹣1
②2CH3OH(g)⇌CH3OCH3(g)+H2O(g)△H2=﹣23.5kJ•mol﹣1
③CO(g)+H2O(g)⇌CO2(g)+H2(g)△H3=﹣41.2kJ•mol﹣1