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25. [tex] \frac{ {a}^{3} c - b}{b + {c}^{2} } \\ = \frac{ {2}^{3} 3 - 1}{1 + {3}^{2} } \\ = \frac{(8 \times 3) - 1}{1 + 9} \\ = \frac{24 - 1}{10} \\ = \frac{23}{10} = 2.3[/tex]

26.[tex] \sqrt{12} + \sqrt{75} - \sqrt{3} - \sqrt{147} \\ = 2 \sqrt{ 3} + 5 \sqrt{3} - \sqrt{3} - 7 \sqrt{3} \\ = - \sqrt{3}[/tex]

27.[tex]2 \sqrt{3} \times 3 \sqrt{3} \\ = 6 \times 3 = 18[/tex]

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