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

Toán Lớp 6: 2 . ( x + 9 ) chia hết cho ( x + 4 ) 3. ( x + 10 ) chia hết cho ( x – 3 )

Toán Lớp 6: 2 . ( x + 9 ) chia hết cho ( x + 4 )
3. ( x + 10 ) chia hết cho ( x – 3 )

Comments ( 1 )

  1. 2)x+9 vdots x+4
    Vì x+4 vdots x+4
    =>{(x+9)-(x+4)}/(x+4)
    =>5/(x+4)
    =>5 vdots x+4
    =>x+4 in Ư(5)={+-1;+-5} ( làm như tìm x khi x=-1; x=1;…)
    =>x in {-3; -5; 1; -9}
    2)x+10 vdots x-3
    =>x+13-3 vdots x-3
    Vì x+3 vdots x-3
    =>{(x+13-3)-(x-3)}/(x-3)
    =>13/(x-3)
    =>13 vdots x-3
    =>x-3 in Ư(13)={+-1; +-13} (làm như tìm x khi x-3=1; x-3=-1;…)
    =>x in {4; 2; 16; -10}

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