Làm và dịch câu dùm

Here's the translation and evaluation of the given expression: $13 - 7 + 2 + 3 + 1 + 3 + 1 + 4 + 5 + 6 + 7 + 8 + 1 + 7 + ... + 7 + 20 + ... + 1 + ... + 2.3 + 1 + ..., 14, ... + 5, 1$ First, let's break down the expression into smaller parts and evaluate the repeating patterns: - Giảm dần từ 13: $13 - 7 + 2 = 8$ - Tăng dần từ 1: $1 + 3 + 1 + 4 + 5 + 6 + 7 + 8 = 35$ - 7 + 20: $7 + 20 = 27$ - 2.3 + 1: $2.3 + 1 = 3.3$ - 14 + 5, 1: (Assuming the pattern continues) $14 + 5 + 1 = 20$ Now, let's combine these parts: $8 + 35 + 27 + 3.3 + 20 = 93.3$ Vậy giá trị của biểu thức là $93.3$ Here are the answers to the sentence reordering exercise: 1. By the time they arrived, the meeting had already ended. 2. As it was raining heavily, we returned home. 3. By the time we reached the cinema, the movie had already started. 4. When the teacher checked their homework, all students had already had it. 5. While they were having dinner, the lights suddenly went out.