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

Toán Lớp 8: thực hiện phép tính (x^2-x^3).(x-5) (2x+y^2)(2x-y^2)

Toán Lớp 8: thực hiện phép tính
(x^2-x^3).(x-5)
(2x+y^2)(2x-y^2)

Comments ( 2 )

  1. a) (x^2-x^3).(x-5)
    =(x^{2}.x)-(x^{2}.5)-(x^{3}.x)+x^{3}.5)
    =x^3-5x^2-x^4+5x^3
    =-x^4+(5x^3+x^3)-5x^2+5x
    =-x^4+6x^3-5x^2+5x
    b) (2x+y^2)(2x-y^2)
    =4x^2-y^4

  2. (x^2-x^3)(x-5)
    =x^3-5x^2-x^4+5x^3
    =-x^4+6x^3-5x^2
    (2x+y^2)(2x-y^2)
    =(2x)^2-(y^2)^2
    =4x^2-y^4
     

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

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