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

Toán Lớp 8: tìm x : a.(3x/7-1):(-2)=4/5 b.-13/27.x+2/9=|1/9-1/3|

Toán Lớp 8: tìm x :
a.(3x/7-1):(-2)=4/5
b.-13/27.x+2/9=|1/9-1/3|

Comments ( 1 )

  1. Giải đáp:
    a) x = ( – 7)/5
    b) x = 0
    Lời giải và giải thích chi tiết:
    a) ( (3x)/7 – 1 ) : ( – 2 ) = 4/5
    => (3x)/7 – 1 = 4/5 . ( – 2 )
    => (3x)/7 – 1 = ( – 8 )/5
    => (3x)/7 =  ( – 8 )/5 + 5/5
    => (3x)/7 = ( – 3 )/5
    => 3x =  ( – 3 )/5 . 7
    =>  3x = ( – 21 )/5
    => x =  ( – 21 )/5 . 1/3
    => x = ( – 7)/5
    Vậy x = ( – 7)/5
    b) (– 13)/27 . x + 2/9 = | 1/9 – 1/3 |
    (- 13)/27 . x + 2/9 = | 1/9 – 3/9 |
    (- 13)/27 . x + 2/9 = | ( – 2 )/9 |
    (- 13)/27 . x + 2/9 = 2/9
    => (- 13)/27 . x = 0
    => x = 0
    Vậy x = 0

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