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Let's evaluate each expression given \(x = 7\), \(y = 3\), and \(z = 9\).

13. \(z + 2\)
\[ 9 + 2 = 11 \]

14. \(5 + x\)
\[ 5 + 7 = 12 \]

15. \(2 + 4z\)
\[ 2 + 4 \cdot 9 = 2 + 36 = 38 \]

16. \(15 - 2x\)
\[ 15 - 2 \cdot 7 = 15 - 14 = 1 \]

17. \(\frac{6y}{z}\)
\[ \frac{6 \cdot 3}{9} = \frac{18}{9} = 2 \]

18. \(\frac{9x}{y}\)
\[ \frac{9 \cdot 7}{3} = \frac{63}{3} = 21 \]

19. \(\frac{xy}{3} + 2\)
\[ \frac{7 \cdot 3}{3} + 2 = 7 + 2 = 9 \]

20. \(10 - \frac{xz}{9}\)
\[ 10 - \frac{7 \cdot 9}{9} = 10 - 7 = 3 \]

21. \(4z - 3y\)
\[ 4 \cdot 9 - 3 \cdot 3 = 36 - 9 = 27 \]

22. \(3x - 2y\)
\[ 3 \cdot 7 - 2 \cdot 3 = 21 - 6 = 15 \]

23. \(2x + 3z + 5y\)
\[ 2 \cdot 7 + 3 \cdot 9 + 5 \cdot 3 = 14 + 27 + 15 = 56 \]

24. \(5z - 3x - 2y\)
\[ 5 \cdot 9 - 3 \cdot 7 - 2 \cdot 3 = 45 - 21 - 6 = 18 \]

25. \(7z - (y + x)\)
\[ 7 \cdot 9 - (3 + 7) = 63 - 10 = 53 \]

26. \((8y + 5) - 2z\)
\[ (8 \cdot 3 + 5) - 2 \cdot 9 = (24 + 5) - 18 = 29 - 18 = 11 \]

27. \(3y + (7z - 4x)\)
\[ 3 \cdot 3 + (7 \cdot 9 - 4 \cdot 7) = 9 + (63 - 28) = 9 + 35 = 44 \]

28. \(6x - (z - 2y) + 15\)
\[ 6 \cdot 7 - (9 - 2 \cdot 3) + 15 = 42 - (9 - 6) + 15 = 42 - 3 + 15 = 54 \]

29. \(2x + (4z - 13) - 5\)
\[ 2 \cdot 7 + (4 \cdot 9 - 13) - 5 = 14 + (36 - 13) - 5 = 14 + 23 - 5 = 32 \]

30. \((9 - 3y) + 4z - 5\)
\[ (9 - 3 \cdot 3) + 4 \cdot 9 - 5 = (9 - 9) + 36 - 5 = 0 + 36 - 5 = 31 \]

Would you like more details or have any questions?

Here are 5 questions you might want to ask:
1. 如何求解二次方程？
2. 如何计算函数的导数？
3. 什么是三角函数的基本恒等式？
4. 如何计算矩形的面积？
5. 什么是对数的基本性质？

**Tip:** 熟悉常用的代数公式和计算方法，可以帮助你更快速地解决数学问题。

Explore how to solve a series of mathematical expressions involving variables x, y, and z. This problem covers basic algebraic operations, including addition, subtraction, multiplication, division, and fraction calculations. Suitable for students in Grades 6-8.

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