Matematika

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tolong bantuin doonk
tolong bantuin doonk

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  • no 26
    3x + 90 derajat + 2x - 5 = 180
    5x + 85 = 180
    5x = 180-85
    5x = 95
    x = 95 : 5 
    x = 19

    DBE = 2x-5 = 2(19)-5 = 38 - 5 = 33 derajat

    no 27
     3x - 8 + 1/2 x +14 = 90
    3 1/2x + 6 = 90
    3 1/2x = 90-6
    3 1/2 x = 84
    7/2x = 84
    x = 84 x 2/7 
    x = 12

    CBD = 1/2x + 14 = 1/2(12)+14
                               = 6 + 14 = 20 derajat

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