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

Toán Lớp 8: phân tích đa thức thành nhân tử (6x+5)^2(3x+2)(x+1)-6

Toán Lớp 8: phân tích đa thức thành nhân tử
(6x+5)^2(3x+2)(x+1)-6

Comments ( 1 )

  1. (6x+5)2(3x+2)(x+1)-6
    =(36x2 +60x+25)(3x2+5x+2)-6
    =[12(3x2+5x+2)+1](3x2+5x+2)-6
    =12(3x2+5x+2)2 +(3x2+5x+2)-6
    =12a2+3a-6
    =12a2-8a+9a-6
    =4a(3a-2)+3(3a-2)=(4a+3)(3a-2)
    =(12x2+20x+11)(9x2+15x+4)
    =(12x2+20x+11)(3x+1)(3x+4)

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