由A和B进行均相二级不可逆反应<img src="https://nimg.ppkao.com/2019-05/tangling/2019051717064363030.jpg?sign=664152ab4b37b59daa0945f8c17ab2da&t=62d5c7a8" />，速率方程：<img src="https://nimg.ppkao.com/2019-05/tangling/2019051717065843173.jpg?sign=c9620248dbe65b5f02644f56629a6cd1&t=62d5c7a8" /> 求当<img src="https://nimg.ppkao.com/2019-05/tangling/2019051717091427765.jpg?sign=5cfb97ff7a3b9fef07ae787107ae2aac&t=62d5c7a8" />时的积分式。