`A=2\sqrt{2}-3\sqrt{18}+4\sqrt{32}-\sqrt{50}`
`A=2\sqrt{2}-9\sqrt{2}+16\sqrt{2}-5\sqrt{2}`
`A=4\sqrt{2}`
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`B=\sqrt{(1-\sqrt{5})^2}+\sqrt{6+2\sqrt{5}}`
`B=|1-\sqrt{5}|+\sqrt{5+2\sqrt{5}+1}`
`B=\sqrt{5}-1+\sqrt{(\sqrt{5}+1)^2}`
`B=\sqrt{5}-1+|\sqrt{5}+1|`
`B=\sqrt{5}-1+\sqrt{5}+1`
`B=2\sqrt{5}`
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`C=1/(2-\sqrt{6})+1/(2+\sqrt{6})`
`C=(2-\sqrt{6}+2+\sqrt{6})/((2-\sqrt{6})(2+\sqrt{6}))`
`C=(4)/(4-6)`
`C=-4/2`
`C=-2`
