Explicação passo-a-passo:
A
[tex] \sqrt{50} + 4 \sqrt{18} - 6 \sqrt{2} [/tex]
[tex]\sqrt{5 {}^{2} \times 2 } + 4 \sqrt{3 {}^{2} \times 2 } - 6 \sqrt{2} [/tex]
[tex] \sqrt{5 {}^{2} } \sqrt{2} + 4 \sqrt{3 {}^{2} } \sqrt{2} - 6 \sqrt{2} [/tex]
[tex]5 \sqrt{2} + 4 \times 3 \sqrt{2} - 6 \sqrt{2} [/tex]
[tex]5 \sqrt{2} + 12 \sqrt{2} - 6 \sqrt{2} [/tex]
[tex](5 + 12 - 6) \sqrt{2} [/tex]
[tex](17 - 6) \sqrt{2} [/tex]
[tex]11 \sqrt{2} [/tex]
B
[tex]2 \sqrt{20} - 4 \sqrt{45} + \sqrt{125} [/tex]
[tex]2 \sqrt{2 {}^{2} \times 5} - 4 \sqrt{3 {}^{2} \times 5 } + \sqrt{5 {}^{3} } [/tex]
[tex]2 \sqrt{2 {}^{2} } \sqrt{5} - 4 \sqrt{3 {}^{2} } \sqrt{5} + \sqrt{5 {}^{2 + 1} } [/tex]
[tex]2 \times 2 \sqrt{5} - 4 \times 3 \sqrt{5} + \sqrt{5 {}^{2} \times 5 {}^{1} } [/tex]
[tex]4 \sqrt{5} - 12 \sqrt{5} + \sqrt{5 {}^{2 } \times 5} [/tex]
[tex]4 \sqrt{5} - 12 \sqrt{5} + \sqrt{5 {}^{2} } \sqrt{5} [/tex]
[tex]4 \sqrt{5} - 12 \sqrt{5} + 5 \sqrt{5} [/tex]
[tex](4 - 12 + 5) \sqrt{5} [/tex]
[tex]( - 8 + 5) \sqrt{5} [/tex]
[tex] - 3 \sqrt{5} [/tex]
C
[tex]5 \sqrt{3} + \sqrt{12} - 5 \sqrt{48} [/tex]
[tex]5 \sqrt{3} + \sqrt{2 {}^{2} \times 3 } - 5 \sqrt{4 {}^{2} \times 3 } [/tex]
[tex]5 \sqrt{3} + \sqrt{2 {}^{2} } \sqrt{3} - 5 \sqrt{4 {}^{2} } \sqrt{3} [/tex]
[tex]5 \sqrt{3} + 2 \sqrt{3} + 5 \times 4 \sqrt{3} [/tex]
[tex]5 \sqrt{3} + 2 \sqrt{3} - 20 \sqrt{3} [/tex]
[tex](5 + 2 - 20) \sqrt{3} [/tex]
[tex](7 - 20) \sqrt{3} [/tex]
[tex] - 13 \sqrt{3} [/tex]
D
[tex] - 2 \sqrt{10} - 5 \sqrt{90} + 6 \sqrt{10} - 8 \sqrt{40} [/tex]
[tex] - 2 \sqrt{10} - 5 \sqrt{3 {}^{2} \times 10} + 6 \sqrt{10} - 8 \sqrt{2 {}^{2} \times 10} [/tex]
[tex] - 2 \sqrt{10} - 5 \sqrt{3 {}^{2} } \sqrt{10} + 6 \sqrt{10} - 8 \sqrt{2 {}^{2} } \sqrt{10} [/tex]
[tex] - 2 \sqrt{10} - 5 \times 3 \sqrt{10} + 6 \sqrt{10} - 8 \times 2 \sqrt{10} [/tex]
[tex] - 2 \sqrt{10} - 15 \sqrt{10} + 6 \sqrt{10} - 16 \sqrt{10} [/tex]
[tex]( - 2 - 15 + 6 - 16) \sqrt{10} [/tex]
[tex]( - 17 + 6 - 16) \sqrt{10} [/tex]
[tex]( - 11 - 16) \sqrt{10} [/tex]
[tex] - 27 \sqrt{10} [/tex]
E
[tex] \sqrt[3]{2} + \sqrt{2} + 3 \sqrt{2} + 2 \sqrt[3]{2} - \sqrt{8} [/tex]
[tex] \sqrt[3]{2} + \sqrt{2} + 3 \sqrt{2} + 2 \sqrt[3]{2} - \sqrt{2 {}^{3} } [/tex]
[tex] \sqrt[3]{2} + \sqrt{2} + 3 \sqrt{2} + 2 \sqrt[3]{2} - \sqrt{2 {}^{2 + 1} } [/tex]
[tex] \sqrt[3]{2} + \sqrt{2} + 3 \sqrt{2} + 2 \sqrt[3]{2} - \sqrt{2 {}^{2} \times 2 {}^{1} } [/tex]
[tex] \sqrt[3]{2} + \sqrt{2} + 3 \sqrt{2} + 2 \sqrt[3]{2} - \sqrt{2 {}^{2} \times 2 } [/tex]
[tex] \sqrt[3]{2} + \sqrt{2} + 3 \sqrt{2} + 2 \sqrt[3]{2} - \sqrt{2 {}^{2} } \sqrt{2} [/tex]
[tex] \sqrt[3]{2} + \sqrt{2} + 3 \sqrt{2} + 2 \sqrt[3]{2} - 2 \sqrt{2} [/tex]
[tex](1 + 2) \sqrt[3]{2} + (1 + 3 - 2) \sqrt{2} [/tex]
[tex]3 \sqrt[3]{2} + (4 - 2) \sqrt{2} [/tex]
[tex]3 \sqrt[3]{2} + 2 \sqrt{2} [/tex]