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

Toán Lớp 8: giúp mình ra kết quả : -3xy(2x+5y-2)

Toán Lớp 8: giúp mình ra kết quả : -3xy(2x+5y-2)

Comments ( 2 )

  1. – 3xy ( 2x + 5y – 2 )
    = ( -3xy . 2x ) + ( -3xy . 5y ) + [-3xy . ( -2 ) ]
    = -6x^2 y – 15x y^2 + 6xy
     

  2. $\text{-3xy(2x+5y-2)}$
    $\text{=(-3xy.2x)+(-3xy.5y)-(-3xy.2)}$
    $\text{=-6x²y-15xy²+6xy}$
     

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

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