diketahui barisan 64,32,16,8 tentukan 1. Rasionya 2.rumus suku ke n 3.U8 dan U12

<p>Ok saya bantu jawab ya.........</p><p>&nbsp;</p><p>64, &nbsp;32, &nbsp;16, &nbsp; 8, .....</p><p>Dari bentuk barisannya, ini adalah barisan geometri&nbsp;</p><p>a. <strong>Menentukan rasio (r)</strong></p><p>&nbsp; &nbsp; &nbsp;r = U_n/U_n-1</p><p>&nbsp; &nbsp; &nbsp; &nbsp; = 32/64</p><p>&nbsp; &nbsp; &nbsp; &nbsp; = 1/2</p><p>&nbsp; &nbsp; &nbsp;Jadi, rasionya adalah 1/2</p><p>&nbsp;</p><p>b. <strong>Menentukan rumus suku ke-n</strong></p><p>&nbsp; &nbsp; &nbsp;a = 64</p><p>&nbsp; &nbsp; &nbsp;r = 1/2</p><p>&nbsp; &nbsp; &nbsp;Rumus umum suku ke-n barisan geometri adalah</p><p>&nbsp; &nbsp; &nbsp;U_n = ar^n-1&nbsp;</p><p>&nbsp; &nbsp; &nbsp;U_n = (64)(1/2)^n-1&nbsp;</p><p>&nbsp; &nbsp; &nbsp;U_n = (2⁶)(1/2^n-1 )</p><p>&nbsp; &nbsp; &nbsp;U_n = (2⁶/2^n-1)&nbsp;</p><p>&nbsp; &nbsp; &nbsp;Rumus suku ke-n adalah <strong>U_n = (2⁶/2^n-1)&nbsp;</strong></p><p>&nbsp;</p><p>c. <strong>Mencari U₈ &nbsp; dan U₁₂</strong></p><ul><li>U₈ = 2⁶/2⁷</li></ul><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2^6-7</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2^-1</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = <strong>1/2</strong></p><p>&nbsp;</p><ul><li>U₁₂ = 2⁶/2¹¹</li></ul><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2^6-11</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2^-5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 1/2⁵</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 1/32</p>