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

Toán Lớp 8: Thực hiện phép tính sau: 2x+3y/2-x : 4x^2+12xy+9y^2/x^3-8

Toán Lớp 8: Thực hiện phép tính sau:
2x+3y/2-x : 4x^2+12xy+9y^2/x^3-8

Comments ( 2 )

  1. (2x+3y)/(2-x) : (4x^2+12xy+9y^2)/(x^3-8)
    =(2x+3y)/(2-x).(x^3-8)/(4x^2+12xy+9y^2)
    =(2x+3y)/(2-x).((x-2)(x^2+2x+4))/(2x+3y)^2
    =-1/(x-2).(x-2)(x^2+2x+4)
    =-(x-2)(x^2+2x+4)
    =-(x^3-8)
    =-x^3+8
     

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

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