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

Toán Lớp 9: giải phươ ng trình 7-(2x+4)=-(x+4)

Toán Lớp 9: giải phươ ng trình 7-(2x+4)=-(x+4)

Comments ( 2 )

  1. 7 – (2x + 4) =-(x + 4)
    ⇔ 7 − 2x − 4 = − (x + 4)
    ⇔ 3 − 2x = − (x + 4)
    ⇔ 3 − 2x = − x − 4
    ⇔ 3 − 2x + x = − 4
    ⇔ 3 − x = − 4
    − x = − 4 − 3
    − x = − 7
    x = 7
    Cho mình xin hay nhất nha bạn!!!!
    @Drew Mclntyre

  2. Ta có : 7 – ( 2x + 4 ) = – ( x + 4 )
    ⇔ x – 2x = 4 – 7 – 4
    ⇔ – x = – 7
    ⇔ x = 7

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