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Ursuletul4
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Daca a= |√3-2√7| si b= |√3+2√7|, calculati √ab/5 -1.
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Răspuns :

Renatemambouko
a= |√3-2√7| si b= |√3+2√7|, calculati √ab/5 -1
√3-2√7<0
|√3-2√7|=-(√3-2√7)=2√7-√3

√3+2√7>0
I√3+2√7I>√3+2√7=2√7+√3

a×b=(2√7-√3)(2√7+√3)=28-3=25

√ab/5 -1 =√(25/5 -1)=√(5 -1)=√4=2

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