1[tex]2 \sqrt{128} - \sqrt{72} [/tex]2.[tex](3 \sqrt{2} + \sqrt{50} ) \times \sqrt{2} [/tex]3.[tex](6 - \sqrt{3} ) \times \sqrt{2} [/tex]

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[2\sqrt{128} - \sqrt{72}]
[= 2\sqrt{64 \times 2} - \sqrt{36 \times 2}]
[= 2 \times 8\sqrt{2} - 6\sqrt{2}]
[= 16\sqrt{2} - 6\sqrt{2}]
[= 10\sqrt{2}]

[(3\sqrt{2} + \sqrt{50}) \times \sqrt{2}]
[= 3\sqrt{2} \times \sqrt{2} + \sqrt{50} \times \sqrt{2}]
[= 3 \times 2 + \sqrt{100}]
[= 6 + 10]
[= 16]

[(6 - \sqrt{3}) \times \sqrt{2}]
[= 6\sqrt{2} - \sqrt{6}]
[= 6\sqrt{2} - 2.45]