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

Toán Lớp 5: tìm x ( 7 .13 + 8 . 13 ) : ( 13 / 2 – x ) = 39

Toán Lớp 5: tìm x
( 7 .13 + 8 . 13 ) : ( 13 / 2 – x ) = 39

Comments ( 2 )

  1. (7 . 13 + 8 . 13) : (13/2 – x) = 39
    ⇒ 13 . (7 + 8) : (13/2 – x) = 39
    ⇒ 195 : (13/2 – x) = 39
    ⇒ 13/2 – x = 5
    ⇒ x = 13/2 – 5 = 3/2
    Vậy  x = {3/2}

  2. Ta có:
    (7.13+8.13):(13/2-x)=39
    ⇔13.(7+8):(13/2-x)=39
    ⇔13.15:(13/2-x)=39
    ⇔195:(13/2-x)=39
    ⇔13/2-x=195:39=5
    ⇔x=13/2-5
    ⇔x=3/2
     

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

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