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

Toán Lớp 6: 9 × x – 16 – 7 × x +5 + 4 × x + 47 = 0

Toán Lớp 6: 9 × x – 16 – 7 × x +5 + 4 × x + 47 = 0

Comments ( 2 )

  1. Giải đáp:
    x=-6
    Trình bày lời giải:
    9 × x – 16 – 7 × x +5 + 4 × x + 47 = 0
    =>(9xx x-7 xx x+4xx x)+(-16+5+47)=0
    =>x xx(9-7+4)+(-11+47)=0
    =>x xx6+36=0
    =>x xx6=0-36
    =>x xx6=-36
    =>x=-36:6
    =>x=-6
    Vậy x=-6

  2. 9 xx x – 16 – 7 xx x + 5 + 4 x x + 47 = 0
    ⇔ x xx ( 9 – 7 + 4 ) – ( 16 – 5 – 47 ) = 0
    ⇔ x xx 6 – ( – 36 ) = 0
    ⇔ x xx 6 = 0 + ( – 36 )
    ⇔ x xx 6 = – 36
    ⇔ x = – 36 : 6
    ⇔ x = – 6
    Vậy , x = – 6 .

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