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

Toán Lớp 6: Bài 2: Tìm x: k, 5x + x = 39 – $3^{11}$ : $3^{9}$ l, 7x – x = $5^{21}$ : $5^{19}$ + 3.2² – $7^{0}$ m, 7x – 2x = $6^{17}$ : $6^{15}$ +

Toán Lớp 6: Bài 2: Tìm x:
k, 5x + x = 39 – $3^{11}$ : $3^{9}$
l, 7x – x = $5^{21}$ : $5^{19}$ + 3.2² – $7^{0}$
m, 7x – 2x = $6^{17}$ : $6^{15}$ + 44 : 11
u, 2x + 3x + 4x = 2.5 ² – 14

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     k) 5x+x=39-3^11÷3^9
    <=>6x=39-3^2
    <=>6x=39-9
    <=>6x=30
    <=>x=5
    text{vậy} S={5}
     l) 7x-x=5^21÷5^19+3×2^2-7^0
    <=>6x=5^2+3×4-1
    <=>6x=25+12-1
    <=>6x=36
    <=>x=6
    text{vậy} S={6}
     m) 7x-2x=6^17÷6^15+44÷11
    <=>5x=6^2+4
    <=>5x=36+4
    <=>5x=40
    <=>x=8
    text{vậy} S={8}
     u) 2x+3x+4x=2×5^2-14
    <=>9x=2×25-14
    <=>9x=50=14
    <=>9x=36
    <=>x=4
    text{vậy} S={4} 
         text{xin 5 sao và hay nhất nha}

  2. k) 5x + x = 39 – 3^11 : 3^9
    => 6x = 39 – 3^2
    => 6x = 39 – 9
    => 6x = 30
    =>   x = 30 : 6
    =>   x = 5
    l) 7x – x = 5^21 : 5^19 + 3 . 2^2 – 7^0
    => 6x = 5^2 + 3 . 4 – 1
    => 6x = 25 + 12 – 1
    => 6x = 36
    =>   x = 6
    m) 7x – 2x = 6^17 : 6^15 + 44 : 11
    => 5x = 6^2 + 4
    => 5x = 36 + 4
    => 5x = 40
    =>   x = 40 : 5
    =>   x = 8
    u) 2x + 3x + 4x = 2 . 5^2 – 14
    => 9x = 2 . 25 – 14
    => 9x = 50 – 14
    => 9x = 36
    =>   x = 36 : 9
    =>   x = 4      
     

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

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