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

Toán Lớp 6: c(–300) : 20 + 5 . (3x –1) =25

Toán Lớp 6: c(–300) : 20 + 5 . (3x –1) =25

Comments ( 2 )

  1. c)
    (–300) : 20 + 5 . (3x –1) =25
    (–15) + 5 . (3x –1) =25
    5 . (3x –1) =25-(-15)
    5 . (3x –1) =25+15
    5 . (3x –1) =40
     (3x –1) =40:5
    3x -1 =8
    3x  =8+1
    3x-9
    x=9:3
    x=3
    Vậy x=3

  2. Giải đáp + Lời giải và giải thích chi tiết :
    ( – 300 ) : 20 + 5 ( 3x – 1 ) = 25
    ⇔ – 15 + 15x – 5 = 25
    ⇔ – 20 + 15x = 25
    ⇔ 15x = 25 + 20
    ⇔ 15x = 45
    ⇔ x = 45 : 15
    ⇔ x = 3
    Vậy x = 3
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222-9+11+12:2*14+14 = ? ( )

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