[tex]1). \: 3 \sqrt{8} - \sqrt{50} + 2 \sqrt{18} \\ 2). \: \sqrt{12} - \sqrt{27} - 2 \sqrt{75} \\ [/tex]
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Step-by-step explanation:

[tex]\bf 3\sqrt{8} -\sqrt{50} +2\sqrt{18} =[/tex]

[tex]\bf 3\sqrt{2^{3}} -\sqrt{2\cdot5^{2}} +2\sqrt{2\cdot3^{2}} =[/tex]

[tex]\bf 3\cdot 2\sqrt{2} -5\sqrt{2} +2\cdot3\sqrt{2} =[/tex]

[tex]\bf 6\sqrt{2} -5\sqrt{2} +6\sqrt{2} =[/tex]

[tex]\bf 12\sqrt{2} -5\sqrt{2} =\green{\underline{~7\sqrt{2}~}}[/tex]

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[tex]\bf \sqrt{12} -\sqrt{27} +2\sqrt{75} =[/tex]

[tex]\bf \sqrt{2^{2}\cdot3} -\sqrt{3^{3}} +2\sqrt{3\cdot5^{2}} =[/tex]

[tex]\bf 2\sqrt{3} -3\sqrt{3} +2\cdot5\sqrt{3} =[/tex]

[tex]\bf 2\sqrt{3} -3\sqrt{3} +10\sqrt{3} =[/tex]

[tex]\bf 12\sqrt{3} -3\sqrt{3}=\blue{\underline{~9\sqrt{3}~}}[/tex]

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