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

Toán Lớp 8: Rút gọn: S= (2+x/2-x – 4x^2/x^2 -4 -2-x/2+x) : 3x – x^2/ 2x^2 -x^3

Toán Lớp 8: Rút gọn: S= (2+x/2-x – 4x^2/x^2 -4 -2-x/2+x) : 3x – x^2/ 2x^2 -x^3

Comments ( 1 )

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

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