好似呢條咁 我a 做完但睇晒啲notes都見唔到有相似題型係b c part 冇得參考吓Hint: (b) (i) u_xy - (1/2x) u_y = (u_x - (1/2x)u)_x (b) (ii) similar (c) method of characteristic 有general formula去plug唔知你有無學過
好似呢條咁 我a 做完但睇晒啲notes都見唔到有相似題型係b c part 冇得參考吓