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

Toán Lớp 6: 3x+9 ⋮ 2x+1 help meeeeeeeeeeeeeeee

Toán Lớp 6: 3x+9 ⋮ 2x+1
help meeeeeeeeeeeeeeee

Comments ( 2 )

  1. Giải đáp:
    3x + 9 : 2x + 1
    3x + 9 : 2x + 6 – 5
    3 ( x + 3 ) : 2 ( x + 3 ) – 5
    x + 3 : 5 
    x: 2 
    suy ra x thuộc ước của 2
     

  2. ⇔2x+1∈{1;−1;3;−3;5;−5;15;−15}
    hay 
     

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