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

Toán Lớp 6: $Tìm$ $x$$,$ $biết$: $a,$$17-x=7-6x$ $b,$ $-1+3x=5x-6$ $a,$

Toán Lớp 6: $Tìm$ $x$$,$ $biết$:
$a,$$17-x=7-6x$
$b,$ $-1+3x=5x-6$ $a,$

Comments ( 2 )

  1. Lời giải:
    a)
    17-x=7-6x
    ⇔-x+6x=7-17
    ⇔5x=-10
    ⇔x=-2
    Vậy x=-2
    b)
    -1+3x=5x-6
    ⇔3x-5x=-6+1
    ⇔-2x=-5
    ⇔x=5/2
    Vậy x=5/2

  2. a)
    17 – x = 7 – 6x
    ⇒ 17 – 7 = -6x + x
    ⇒ 10 = -5x
    ⇒ x = -2
    b)
    -1 + 3x = 5x – 6
    ⇒ -1 + 6 = 5x – 3x
    ⇒5 = 2x
    ⇒ x = 5/2

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