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

Toán Lớp 8: Biết (2x – 1)(3x + 2) = ax2 + bx + c. Tính a + b + c

Toán Lớp 8: Biết (2x – 1)(3x + 2) = ax2 + bx + c. Tính a + b + c

Comments ( 1 )

  1. Giải đáp: (2x-1)(3x+2)= 6x² + x -2
    => a=6; b=1; c=-2
    =>a+b+c=6+1-2=5
     
    Xin hay nhất 

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