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Kongou
@Kongou
August 2022
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1) 2/√7=?
2)2/√2+1=?
3) 3-√3/2√3=?
4)a-2/√a-2√2=?
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Lesben
2/√7=2.√7/√7.√7=2√7/7
2/(√2 +1)=2.(√2-1)/(√2+1)(√2-1)=2.(√2-1)/(2-1)=2(√2-1)
(3-√3)/2√3=(3-√3)√3/2√3√3=(3√3-3)/2.3=3(√3-1)/6=(√3-1)/2
(a-2)/(√a-2√2)=(a-2)(√a+2√2)/(√a-2√2)(√a+2√2)=
=(a-2)(√a+2√2)/(a-8), a≠8
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Answers & Comments
2/(√2 +1)=2.(√2-1)/(√2+1)(√2-1)=2.(√2-1)/(2-1)=2(√2-1)
(3-√3)/2√3=(3-√3)√3/2√3√3=(3√3-3)/2.3=3(√3-1)/6=(√3-1)/2
(a-2)/(√a-2√2)=(a-2)(√a+2√2)/(√a-2√2)(√a+2√2)=
=(a-2)(√a+2√2)/(a-8), a≠8