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

Toán Lớp 8: a/x^3-2x^2-x+2 b/ 10x^2(x+y)-5(2x+2y)y^2 jup vs ạ

Toán Lớp 8: a/x^3-2x^2-x+2 b/ 10x^2(x+y)-5(2x+2y)y^2 jup vs ạ

Comments ( 2 )

  1. a)
    $x^3 – 2x^2 – x + 2$
    =x^2(x-2)-(x-2)
    =(x^2-1)(x-2)
    =(x-1)(x+1)(x-2)
    b)
    10x^2(x+y)-5(2x+2y)y^2
    =10x^2(x+y)-10(x+y)y^2
    =10(x^2-y^2)(x+y)
    =10(x-y)(x+y)(x+y)
    =10(x-y)(x+y)^2

  2. a) x^3-2x^2-x+2
    =(x^3-2x^2)-(x-2)
    =x^2(x-2)-(x-2)
    =(x-2)(x^2-1)
    =(x-2)(x-1)(x+1)
    b) 10x^2(x+y)-5(2x+2y)y^2
    =10x^2(x+y)-2.5(x+y)y^2
    =10x^2(x+y)-10(x+y)y^2
    =10(x+y)(x^2-y^2)
    =10(x+y)(x-y)(x+y)
    =10(x-y)(x+y)^2
     

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