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

Toán Lớp 8: thực hiện phép tính: a, x^2(x^2+2xy-xy^2) b, (x-2)(x^2+x-2) c, (4x^2y^2-20xy+10xy^2) d, (3x^3-2x^2+2x+1):(x^2-

Toán Lớp 8: thực hiện phép tính:
a, x^2(x^2+2xy-xy^2) b, (x-2)(x^2+x-2)
c, (4x^2y^2-20xy+10xy^2) d, (3x^3-2x^2+2x+1):(x^2-x+1)
giúp mình với!

Comments ( 2 )

  1. a. x^2(x^2+2xy-xy^2)
    =x^2.x^2+x^2.2xy+x^2.(-xy^2)
    =x^4+2x^3y-x^3y^2
    b. (x^2)(x^2+x-2)
    =x^2.x^2+x^2.x+x^2.(-2)
    =x^4+x^3-2x^2
    c. (4x^2y^2-20xy+10xy^2)
    =2xy(2xy-10+5y)
     

  2. a) x^2(x^2+2xy-xy^2)
    =x^4+2x^3y-x^3y^2
    b) (x-2)(x^2+x-2)
    =x^3+x^2-2x-2x^2-2x+4
    =x^2-x^2-4x+4
    c)(4x^2y^2-20xy+10xy^2)
    =2xy(2xy-10+5y)

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