A:①②③
B:②③④
C:①③④
D:①②④
已知:①CH4(g)+H2O(g)⇌CO(g)+3H2(g)△H=+206.2kJ•mol﹣1
②CO(g)+H2O(g)⇌CO2(g)+H2(g)△H=﹣42.3kJ•mol﹣1
读天体系统的示意图,回答下题.
解方程:
(1)3x﹣4=2(x+1)
(2)2-x+56=x-x-13.