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

Toán Lớp 6: a,125 – 3 ( 2 x x + 5) = 104 b,90 – 2 ( 4 x x + 1) = 80 c,35 – ( x + 5 ) = 16 d,127 – 9x ( x – 4 ) = 109 Help với ạ

Toán Lớp 6: a,125 – 3 ( 2 x x + 5) = 104
b,90 – 2 ( 4 x x + 1) = 80
c,35 – ( x + 5 ) = 16
d,127 – 9x ( x – 4 ) = 109
Help với ạ

Comments ( 2 )

  1. $\textit{Giải đáp + Lời giải và giải thích chi tiết:}$
    $\text{a, 125 – 3(2x + 5) = 104}$
    $\text{3(2x + 5) = 125 – 104 = 21}$
    $\text{2x + 5 = 21 : 3 = 7}$
    $\text{2x = 7 – 5 = 2}$
    $\text{x = 2 : 2}$
    $\text{x = 1}$
    $\text{b, 90 – 2(4x + 1) = 80}$
    $\text{2(4x + 1) = 90 – 80 = 10}$
    $\text{4x + 1 = 10 : 2 = 5}$
    $\text{4x = 5 – 1 = 4}$
    $\text{x = 4 : 4}$
    $\text{x = 1}$
    $\text{c, 35 – (x + 5) = 16}$
    $\text{x + 5 = 35 – 16 = 15}$
    $\text{x = 15 – 5}$
    $\text{x = 10}$
    $\text{d, 127 – 9(x – 4) = 109}$
    $\text{9(x – 4) = 127 – 109 = 18}$
    $\text{9x – 36 = 18 }$
    $\text{9x = 18 + 36 = 54}$
    $\text{x = 54 : 9}$
    $\text{x = 6}$

  2. a)
    125-3(2x+5)=104
    =>125-6x-15=104
    =>-6x=-6
    =>x=1
    Vậy x=1
    b)
    90-2(4x+1)=80
    =>90-8x-2=80
    =>-8x=-8
    =>x=1
    Vậy x=1
    c)
    35-(x+5)=16
    =>35-x-5=16
    =>-x=-14
    =>x=14
    Vậy x=14
    d)
    127-9(x-4)=109
    =>127-9x+36=109
    =>-9x=-54
    =>x=6
    Vậy x=6

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

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