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

Toán Lớp 6: . 3x – 17 = x + 3 c. 25 – (x – 5) = -415 – ( 15 – 415)

Toán Lớp 6: . 3x – 17 = x + 3
c. 25 – (x – 5) = -415 – ( 15 – 415)

Comments ( 2 )

  1. 3x – 17 = x + 3
    ⇒ 3x -x = 17 + 3
    ⇒ 2x = 20
    ⇒ x = 20 : 2
    ⇒ x = 10 
    25 – (x – 5) = -415 – (15 – 415)
    ⇒ 25 – x -5 = -415 +15 +415
    ⇒ 30 – x =-15
    ⇒ x = 30 + 15
    ⇒ x = 45
    $@Vân$
    $#BTS$
     

  2. $3x-17=x+3$
    $3x-x=17+3$
    $2x=20$
    $x=10$
    Vậy $x=10$
    —————–
    $25-(x-5)=-415-(15-415)$
    $25-x+5=-415-15+415$
    $30-x=-15$
    $x=30-(-15)$
    $x=45$
    Vậy $x=45$

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