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The first volume of fifth grade mathematics "Huanggang Little Champion" page 30 training topic.
a=√3-√2

And 1/a=√3+√2.

So a- 1/a=-2√2.

a+ 1/a=2√3

So the original formula = | a-1/a |-| a+1/a |-4.

=|-2√2|-|2√3|-4

=2√2-2√3-4

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