`h)3\sqrt{50}-2\sqrt{12}-\sqrt{18}+\sqrt{75}-\sqrt{8}`
`=15\sqrt{2}-4\sqrt{3}-3\sqrt{2}+5\sqrt{3}-2\sqrt{2}`
`=10\sqrt{2}+\sqrt{3}`
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`k)3\sqrt{3x}+\sqrt{12x}-\sqrt{48x}` `(x > 0)`
`=3\sqrt{3x}+2\sqrt{3x}-4\sqrt{3x}`
`=\sqrt{3x}`