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

Toán Lớp 8: tìm a để 3x^3-7x^2+ax-5 chia hết cho x+3

Toán Lớp 8: tìm a để 3x^3-7x^2+ax-5 chia hết cho x+3

Comments ( 1 )

  1. Áp dụng định lí Bơ – zu
    to f(-3)=0
    to 3.(-3)^3-7.(-3)^2+a.(-3)-5=0
    to -81-63-3a-5=0
    to -3a-149=0
    to -3a=149
    to a=-149/3
    Vậy a=-149/3
     

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