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Jika c merupakan vektor proyeksi a = 2 i − 6 j ​ + 4 k pada b = 2 i − j ​ + 2 k , maka panjang vektor adalah ....

Jika  merupakan vektor proyeksi  pada , maka panjang vektor begin mathsize 14px style straight c with rightwards arrow on top end style adalah ....

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Pembahasan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar straight c with rightwards arrow on top close vertical bar end cell equals cell open vertical bar fraction numerator straight a with rightwards arrow on top. straight b with rightwards arrow on top over denominator open vertical bar straight b with rightwards arrow on top close vertical bar end fraction close vertical bar end cell row blank equals cell open vertical bar fraction numerator open parentheses stack 2 straight i with rightwards arrow on top minus 6 straight j with rightwards arrow on top plus 4 straight k with rightwards arrow on top close parentheses space. space open parentheses 2 straight i with rightwards arrow on top minus straight j with rightwards arrow on top plus 2 straight k with rightwards arrow on top close parentheses over denominator square root of 2 cubed plus open parentheses negative 1 close parentheses squared plus open parentheses 2 close parentheses squared end root end fraction close vertical bar end cell row blank equals cell open vertical bar fraction numerator 4 plus 6 plus 8 over denominator square root of 4 plus 1 plus 4 end root end fraction close vertical bar end cell row blank equals cell open vertical bar fraction numerator 18 over denominator square root of 9 end fraction close vertical bar end cell row blank equals cell open vertical bar 18 over 3 close vertical bar end cell row blank equals 6 end table end style 

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Diketahui vektor p ​ = 5 i − 7 j ​ + 4 k pada q ​ = i − 2 j ​ + 2 k . Jika vektor r adalah proyeksi dari vektor p ​ pada q ​ , maka = ....

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