Toán Lớp 9: câu 1
3+√(2-√5)^2
câu 2
√(4-2√5)^2 +4
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Toán Lớp 9: câu 1
3+√(2-√5)^2
câu 2
√(4-2√5)^2 +4
Comments ( 2 )
=3+|2-\sqrt{5}|
=3+\sqrt{5}-2(Vì \sqrt{5}>2)
=1+\sqrt{5}
=|4-2\sqrt{5}| +4
=2\sqrt{5}-4 +4(Vì 2\sqrt{5}>4)
=2\sqrt{5}