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

Toán Lớp 8: Giúp mình với 6x^5y^3:2x^2y^3=? 2x^3.(3x-y)=?

Toán Lớp 8: Giúp mình với
6x^5y^3:2x^2y^3=?
2x^3.(3x-y)=?

Comments ( 2 )

  1. $ 6x^5y^3 : 2x^2y^3 $
    $ = ( 6 : 2 ) . ( x^5 : x^2 ) .( y^3 : y^3 )$
    $ = 3x^3 $
    ————————
    $ 2x^3 ( 3x – y ) $
    $ = 2x^3 . 3x – 2x^3 . y $
    $ = 6x^4 – 2x^3y $

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

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