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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: tìm x a) 3/2 -1/2 :x =1/4 b) 4/x-1 =x-1/9 C) 3^X/5 =4/7

Home/ Toán Lớp 7: tìm x a) 3/2 -1/2 :x =1/4 b) 4/x-1 =x-1/9 C) 3^X/5 =4/7

Toán Lớp 7: tìm x a) 3/2 -1/2 :x =1/4 b) 4/x-1 =x-1/9 C) 3^X/5 =4/7

Tháng Sáu 26, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: tìm x
a) 3/2 -1/2 😡 =1/4
b) 4/x-1 =x-1/9
C) 3^X/5 =4/7

Comments ( 2 )

  1. giahan44
    giahan44
    26 Tháng Sáu, 2022 at 6:58 sáng
    Reply
    a)
    $\frac{3}{2}-$ $\frac{1}{2}:x=$ $\frac{1}{4}$
    $\frac{1}{2}:x=$ $\frac{3}{2}-$ $\frac{1}{4}$
    $\frac{1}{2}:x=$ $\frac{6}{4}-$ $\frac{1}{4}$ 
    $\frac{1}{2}:x=$ $\frac{5}{4}$
    $x=\frac{1}{2}$ $:\frac{5}{4}$ $x=\frac{2}{5}$ 
    b)

  2. thanhbinh2k5
    thanhbinh2k5
    26 Tháng Sáu, 2022 at 6:58 sáng
    Reply
    a) 3/2 – 1/2 😡 = 1/4
    1/2:x = 6/4 – 1/4 = 5/4
    => x = 1/2:5/4 = 4/10 = 2/5
    b)4/(x-1) = (x-1)/9
    => 4/(x-1) = (x-1)/9= (x-1)^2 = 4.9 = 36
    x-1 = 6 hoặc -6
    *x-1 = 6 => x = 7
    *x-1 = -6 => 7
    c) (3^x)/5 = 4/7
    => (3^x).7 = 5.4 = 20
    => 3^x = 20/7
    => x =0.9555892787

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222-9+11+12:2*14+14 = ? ( )

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