Matematika

Pertanyaan

2. a:b = 8:6 ; b= 4/5c dan c-b = 4

3. a/b = b/c ; a+c = 15 dan a= 1/4c

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1 Jawaban

  • 1. C - B = 4
        B =  C - 4
        B = 4/5C
        C - 4 = 4/5C
        C - 4/5C = 4
        1/5C = 4
        C = 4 / (1/5) = 20
        
        C - B = 4
        20 - B = 4
        B = 20 - 4 = 16
      
        A/B = 8/6
        A/16 = 8/6
        6A = 8 * 16
        6A = 128
        A = 128 / 6 = 21,7

    2.  A + C = 15       
        A = 15 - C
         A = 1/4C
          15 - C = 1/4C
           15 = C + 1/4C
           1,25C = 15
           C = 15 / 1,25 = 12
          A = 15 - C = 15 - 12 = 3
          A/B = B/C
          3/B = B/12
          3 * 12 = B * B
          B =  √(3 *12) =  √36 = 6

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