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

Toán Lớp 8: Tìm x : (X-4)*(x-5)-(x-5)*(x+5) giúp mình vs

Toán Lớp 8: Tìm x : (X-4)*(x-5)-(x-5)*(x+5) giúp mình vs

Comments ( 2 )

  1. (x-4)(x-5)-(x-5)(x+5)
    =(x-5)(x-4-x-5)
    =(x-5)(-9)
    =(-9)(x-5)
     

  2. #tnvt
    (x-4)(x-5)-(x-5)(x+5)
    =(x-5)[(x-4)-(x+5)]
    =(x-5)(x-4-x-5)
    =-9(x-5)
    =-9x+45

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

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