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

Toán Lớp 6: tìm X nguyên:(27 – x).(x + 9) =0

Toán Lớp 6: tìm X nguyên:(27 – x).(x + 9) =0

Comments ( 2 )

  1. ( 27- x ) . ( x + 9 ) = 0
    th1 27-x=0 
    =) x=27 
    TH2 x+9=0
    =) x=-9
     

  2. Những tích bằng 0 thì một trong 2 vế bằng 0 
    TH_1 
    27 – x = 0  
    x = 0 + 27
    x = 27
    TH_2 
    x + 9 = 0
    x = 0 – 9
    x = – 9

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

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