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

Toán Lớp 8: 1/x^2+3x+2-2x/x^3+4x^2+4x+1/x^2+5x+6

Toán Lớp 8: 1/x^2+3x+2-2x/x^3+4x^2+4x+1/x^2+5x+6

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     1/[x^2 +3x+2] -[2x]/[x^3 +4x^2 +4x]+1/[x^2 +5x+6]
    =1/[(x+1)(x+2)]-2/[(x+2)^2]+1/[(x+2)(x+3)]
    =[(x+2)(x+3)-2(x+1)(x+3)+(x+1)(x+2)]/[(x+1)(x+2)^2 (x+3)]
    =[x^2 +5x+6 -2x^2 -8x -6 +x^2 +3x+2]/[(x+1)(x+2)^2 (x+3)]
    =2/[(x+1)(x+2)^2 (x+3)]

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