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

Toán Lớp 7: Tìm x. Biết a)5x-3/2=1/3÷2 b) 5/3.x+1/2=4/7

Toán Lớp 7: Tìm x. Biết
a)5x-3/2=1/3÷2
b) 5/3.x+1/2=4/7

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     a) 5x-3/2=1/3:2
    => 5x-3/2=1/3.1/2
    => 5x-3/2=1/6
    => 5x=1/6+3/2
    => 5x= 5/3
    => x=5/3:5
    => x=5/3.1/5
    => x=1/3
    Vậy x \in {1/3}
    b) 5/3.x+1/2=4/7
    => 5/3x=4/7-1/2
    => 5/3x=1/14
    => x=1/14:5/3
    => x=1/14.3/5
    => x=3/70
    Vậy x \in {3/70}
    $@Maruko-chan$

  2. Giải đáp + Lời giải và giải thích chi tiết:
      a) 5x – 3/2 = 1/3 : 2
    -> 5x – 3/2 = 1/3 xx 1/2
    ->5x – 3/2 = 1/6
    -> 5x = 1/6  +3/2
    -> 5x = 1/6 + 9/6
    -> 5x  = 5/3
    -> x = 5/3 : 5
    -> x = 5/3 xx 1/5
    -> x = 1/3
    b) 5/3 . x + 1/2 = 4/7
    -> 5/3 . x = 4/7 – 1/2
    -> 5/3 . x = 8/14 – 7/14
    -> 5/3 . x = 1/14
    -> x = 1/14 : 5/3
    -> x = 1/14 xx 3/5
    -> x = 3/70  

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

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