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

Toán Lớp 8: x (x+1)(x+2)(x+3)+1 bằng bao nhiêu vậy

Toán Lớp 8: x (x+1)(x+2)(x+3)+1 bằng bao nhiêu vậy

Comments ( 2 )

  1. Giải đáp:
     x . (x+1) . (x+2) . (x+3) + 1
    x=-căn bậc hai(5)/2-3/2, x=căn bậc hai(5)/2-3/2
     

  2.     x (x+1)(x+2)(x+3)+1
    = [x(x+3)][(x+1)(x+2)]+1
    = (x^2 +3x)(x^2 +2x+x+2)+1
    = (x^2 +3x)(x^2 +3x+2)+1
    = (x^2 +3x)^2 +2(x^2+3x)+1
    = (x^2 +3x+1)^2

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

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