a) 13-(40-x)=35 b) 14-3*(5-x)=8 c) (3x-2)*(5+x)=0 d) (3x-6)*3=3^4

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a) 13-(40-x)=35
b) 14-3*(5-x)=8
c) (3x-2)*(5+x)=0
d) (3x-6)*3=3^4

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  2. Đáp án: a) x = 62

    b) x = 3

    c) x = 2/3 hoặc x = -5

    d) x = 11

     

    Giải thích các bước giải:

    a) 13 – (40 – x) = 35

    => 40 – x = 13 – 35

    => 40 – x = -22

    => x = 40 – (-22) = 40 + 22 = 62

    b) 14 – 3(5 – x) = 8

    => 3(5 – x) = 6

    => 5 – x = 2

    => x = 5 – 2 = 3

    c) (3x – 2)(5 + x) = 0

    => 3x – 2 = 0 hoặc 5 + x = 0

    => x = 2/3 hoặc x = -5

    d) (3x – 6).3 = 3^4

    => (3x – 6) = 3^4 : 3

    => 3x – 6 = 3^3

    => 3x – 6 = 27

    => 3x = 33

    => x = 11

     

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