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

Toán Lớp 5: Tìm a: a + a x 2 + a x 4 + a x 8 = 15

Toán Lớp 5: Tìm a: a + a x 2 + a x 4 + a x 8 = 15

Comments ( 2 )

  1. a+axx2+axx4+axx8=15
    axx(1+2+4+8)=15
    axx15=15
    a=15:15
    a=1
    Vậy a=1
     

  2. Tìm a: a + a x 2 + a x 4 + a x 8 = 15
    Ta có: a + a x 2 + a x 4 + a x 8 = 15
    ⇔ a x 1 + a x 2 + a x 4 + a x 8 = 15
    ⇔ a x (1+ 2+ 4+ 8)= 15
    ⇔ a x 15= 15
    ⇔ a= 1 

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