Răspuns:
[tex]a)(4 \sqrt{36} - 2 \sqrt{49} ) \div \sqrt{ {2}^{2} \times {5}^{2}} = \\ = (4 \times 6 - 2 \times 7) \div 10 \\ = 10 \div 10 = 1 \\ b)(7 \times \sqrt{169} - 6 \times \sqrt{225} ) \times \sqrt{14 - \sqrt{25} } = \\ (7 \times 13 - 6 \times 15) \times 3 \\ = 1 \times 3 = 3 \\ c)(2 \sqrt{81} \ + 3 \sqrt{100} + 4 \sqrt{169} ) \div \sqrt{ {2}^{4} \times {3}^{2} } \\ = (2 \times 9 + 3 \times 10 + 4 \times 13) \div 12 \\ = (18 + 30 + 52) \div 12 \\ = 100 \div 12 = \frac{100}{12} [/tex]
