Matematika

Pertanyaan

Tentukan himpunan penyelesaian dari
1.) 12+3x=5+2x
2.) 5(x-1)=4x
3.) 3(3-2x)=15-7x
4.) 8-(2-4x)=7x-1
5.) 5x+7(3x+2)=6(4x+1)
6.) 2x+1=x-3
7.) -2x+5=-(x+9)

1 Jawaban

  • 1.) 12+3x = 5+2x
    3x-2x = 5-12
    x= -7
    2.) 5(x-1) = 4x
    5x-5 = 4x
    5x-4x = 5
    x = 5
    3.) 3(3-2x) = 15-7x
    9-6x = 15-7x
    -6x+7x = 15-9
    x = 6
    4.) 8-(2-4x) = 7x-1
    8-2+4x = 7x-1
    4x-7x = -1-6
    -3x = -7
    x = 7/3
    5.) 5x+7(3x+2) = 6(4x+1)
    5x+21x+14 = 24x+6
    26x-24x = 6-14
    2x = -8
    x= -4
    6.) 2x+1 = x-3
    2x-x = -3-1
    x = -4
    7.) -2x+5 = -(x+9)
    -2x+5 = -x-9
    -2x+x = -9-5
    -x = -14
    x = 14

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