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pakai caranya mkasih!
4/√5 + 3 =..?
= 4 × (√5 - 3)/(√5 + 3) × ( -√5 - 3)
= 4 × (√5 - 3)/(√5)² - 3²
= 4 × (√5 - 3)/5 - 3²
= 4 × (√5 - 3)/5 - 9
= 4 × (√5 - 3)/-4
= √5 - 3/-1
= -(√5 - 3)
= -√5 + 3
[tex] \\ \tt{ \red{-Hz-}}[/tex]
[tex] \frac{4}{ \sqrt{5} + 3 } = \frac{4}{ \sqrt{5} + 3 } \times \frac{ \sqrt{5} - 3}{ \sqrt{5} - 3} \\ = \frac{4 \sqrt{5} - 12 }{5 - 3 \sqrt{5} + 3 \sqrt{5} - 9 } \\ = \frac{4 \sqrt{5} - 12}{ - 4} \\ = \frac{4( \sqrt{5} - 3) }{ - 4} \\ = - ( \sqrt{5} - 3) \\ = - \sqrt{5} + 3 \: atau \: 3 - \sqrt{5} [/tex]
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