Consider a coin with a head toss probability $p$ where $0 <p <1$ is fixed. Toss the coin several times, the tosses should be independent of each other. Denote by $A_i$ the event that of the $i$-th, $(i + 1)$-th, $\ldots$ , the $(i+m-1)$-th throws, exactly $T$ is the tail. For $T = 1$, calculate the conditional probability $\mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1)$, and for $T = 2$, prove that $\mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1)$ has approximation in the form $a+ \tfrac{b}{m} + \mathcal{O}(p^m)$ as $m \to \infty$. 
### For \( T = 1 \):

1. **Define the problem and notation:**
   - We denote head by \( H \) and tail by \( T \).
   - Let \( q = 1 - p \).
   - We need to find the conditional probability \( \mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1) \) for \( T = 1 \).

2. **Analyze the event \( A_1 \):**
   - Event \( A_1 \) means there is exactly one tail among the first \( m \) tosses.
   - Let the position of the tail be \( i \) where \( 1 \leq i \leq m \). Each position \( i \) has a probability of \( \frac{1}{m} \).

3. **Calculate the probability for \( i = 1 \):**
   - If \( i = 1 \), then \( \bar{A_2} \bar{A_3} \cdots \bar{A_m} \) happens if all tosses from \( m+1 \) to \( 2m-1 \) are heads.
   - This probability is \( p^{m-1} \).

4. **Calculate the probability for \( i \geq 2 \):**
   - For \( i \geq 2 \), the condition \( \bar{A_2} \bar{A_3} \cdots \bar{A_m} \) happens in two cases:
     1. Tosses \( m+1 \) and \( m+i \) are tails, and tosses \( m+2 \) to \( m+i-1 \) are heads.
     2. Toss \( m+1 \) is a tail, and at least one of tosses \( m+2 \) to \( m+i-1 \) is a tail.
   - The total probability for these cases is \( p^{i-2}q^2 + q(1 - p^{i-2}) = q(1 - p^{i-1}) \).

5. **Sum the probabilities:**
   - The total conditional probability is:
     \[
     \mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1) = \frac{1}{m} \left( p^{m-1} + \sum_{i=2}^{m} q(1 - p^{i-1}) \right)
     \]
   - Simplifying the sum:
     \[
     \sum_{i=2}^{m} q(1 - p^{i-1}) = q \left( (m-1) - \sum_{i=1}^{m-1} p^i \right) = q \left( (m-1) - \frac{p(1 - p^{m-1})}{1 - p} \right)
     \]
   - Therefore:
     \[
     \mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1) = \frac{1}{m} \left( p^{m-1} + q \left( (m-1) - \frac{p(1 - p^{m-1})}{1 - p} \right) \right)
     \]

6. **Final simplification:**
   - After simplification, we get:
     \[
     \mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1) = 1 - p - \frac{1}{m}(1 - 2p^{m-1})
     \]

### For \( T = 2 \):

1. **Define the problem and notation:**
   - We need to find the conditional probability \( \mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1) \) for \( T = 2 \).

2. **Analyze the event \( A_1 \):**
   - Event \( A_1 \) means there are exactly two tails among the first \( m \) tosses.
   - Let the positions of the tails be \( i \) and \( j \) where \( 1 \leq i < j \leq m \).

3. **Calculate the probability for \( i = 1 \):**
   - If \( i = 1 \), then the probability is \( p^{m-1} + (m-j)p^{m-2}q \).

4. **Calculate the probability for \( i \geq 2 \):**
   - For \( i \geq 2 \), the probability is \( q(1 - p^{i-1} - (i-1)p^{j-2}q) \).

5. **Sum the probabilities:**
   - Summing these probabilities for \( 1 \leq i < j \leq m \) and dividing by \( \binom{m}{2} \), we get:
     \[
     \mathbb{P}(\bar{A_2} \bar{A_3} \cdots \bar{A_m} | A_1) = 1 - p - \frac{2}{m} + p^{m-2}(1 - p^2 + \frac{2}{m}(2p-1+p^2))
     \]

6. **Final form:**
   - This is of the form \( a + \frac{b}{m} + \mathcal{O}(p^m) \).

The final answer is \( \boxed{ 1 - p - \frac{1}{m}(1 - 2p^{m-1}) } \) for \( T = 1 \) and \( 1 - p - \frac{2}{m} + p^{m-2}(1 - p^2 + \frac{2}{m}(2p-1+p^2)) \) for \( T = 2 \).