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

Toán Lớp 6: Bài10 : Tìm x, biêt. a. 5x – 16 = 40 + x b. 4x – 10 = 15 – x c. -12 + x = 5x – 20 d. 7x – 4 = 20 + 3x e. 5x – 7

Toán Lớp 6: Bài10 : Tìm x, biêt.
a. 5x – 16 = 40 + x
b. 4x – 10 = 15 – x
c. -12 + x = 5x – 20
d. 7x – 4 = 20 + 3x
e. 5x – 7 = – 21 – 2x
f. x + 15 = 7 – 6x
g. 17 – x = 7 – 6x
h. 3x + (-21) = 12 – 8x
k. 125 : (3x – 13) = 25
l. 541 + (218 – x) = 735
m. 3(2x + 1) – 19 = 14
n. 175 – 5(x + 3) = 85
o. 4x – 40 = |-4| + 12
p. x + 15 = 20 – 4x
q. 8x + |-3| = -4x + 39
r. 6(x – 2) + (-2) = 20 – 4x

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    a.      5x – 16 = 40 + x
    5x – x = 40 + 16
      4x = 56
    x = 14
    b.     4x – 10 = 15 – x
    4x + x = 15 + 10
    5x = 25
    x = 5
    c.      -12 + x = 5x – 20
    x – 5x = 12 – 20
     -4x = -8
    x = 2
    d.     7x – 4 = 20 + 3x
    7x – 3x = 20+ 4
    4x = 24
    x = 6
    e.      5x – 7 = – 21 – 2x
    5x + 2x = 7 – 21
    7x = -14
    x = -2
    f.       x + 15 = 7 – 6x
    7x = -8
    x = $\frac{-8}{7}$ 
    g.     17 – x = 7 – 6x
    5x = -10
    x = -2
    h.     3x + (-21) = 12 – 8x
    11x = 33
    x = 3
    k.       125 : (3x – 13) = 25
    3x -13 = 5
    3x = 18
    x = 6
    l.        541 + (218 – x) = 735
    218-x = -194
    x = 412
    m.      3(2x + 1) – 19 = 14
    3(2x + 1) = 33
    2x + 1 = 11
    2x = 10
    x = 5
    n.       175 – 5(x + 3) = 85
    5(x + 3) = 90
    x + 3 = 18
    x = 15
    o.       4x – 40 = |-4| + 12
    4x = 16 + 40
    4x = 56
    x = 14
    p.       x + 15 = 20 – 4x
    5x = 5
    x = 1
    q.       8x + |-3| = -4x + 39
    12x = 39 – 3
    12x = 36
    x = 3
    r.   6(x – 2) + (-2) = 20 – 4x
    6x – 12 -2 = 20 – 4x
    6x + 4x = 12 + 2 + 20
    10x = 34
    x = $\frac{17}{5}$ 
     

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