tìm x 100 – 7 . x – 5 = 58 12 . x – 1 ÷ 3 =4 mũ 2 + 3 mũ 2 24

Question

tìm x
100 – 7 . x – 5 = 58 12 . x – 1 ÷ 3 =4 mũ 2
+ 3 mũ 2
24 + 5 x = 7 mũ 5 ÷ 7 mũ 2

in progress 0
Cherry 4 years 2020-10-15T13:06:45+00:00 2 Answers 93 views 0

Answers ( )

  1. Nem
    0
    2020-10-15T13:08:14+00:00
    Reply

    Đáp án+giải thích các bước giải:

    a)

    $100 – 7 .x – 5 = 58$

    $100 – 7.x = 58 + 5 = 63$

    $7.x = 100 -63$

    $7.x = 37$

    $x = 37 : 7$

    $x = \dfrac{37}{7}$

    Vậy $x = \dfrac{37}{7}$

    b)

    $12x – \dfrac{1}{3} = 4² + 3²$

    $12x – \dfrac{1}{3} = 25$

    $12x = 25 + \dfrac{1}{3}$ 

    $12x = \dfrac{76}{3}$

    $x = \dfrac{76}{3} : 12$

    $x = \dfrac{19}{9}$ 

    Vậy $x = \dfrac{19}{9}$

    c)

    $24 + 5x = 7^{5} : 7²$

    $24 + 5x = 7³$

    $24 + 5x = 343$

    $5x = 343 -24$

    $5x = 319$

    $x = \dfrac{319}{5}$

    Vậy $x = \dfrac{319}{5}$

  2. Vodka
    0
    2020-10-15T13:08:32+00:00
    Reply

    Đáp án:

    100 – 7 . x – 5 = 58

    100-7.x=58 + 5

    100-7.x=63

    7.x=100-63

    7.x=37

    x=37:7

    x= 37/7

    12 . x – 1 ÷ 3 =4 mũ 2 + 3 mũ 2

    12 . x – 1 ÷ 3 =16 + 9

    12 . x – 1 ÷ 3 =25

    12 . x – 1=25:3

    12.x-1=25/3

    12.x=25/3+1

    12.x=50/28

    x=50/28:12

    x=19/9

    24 + 5 x = 7 mũ 5 ÷ 7 mũ 2

    24 + 5 x =7 mũ 3

    24 + 5 x =343

    5x=343-24

    5x=319

    x=319:5

    x=319/5

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