a, (-5x).(2x²+3x-1) b,(3x-5).(2x²-x+3) c,( 3x²y – 5x²y² + 7xy²): (-xy) d, (4x² – 4x + 1) : (2x – 1)

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1. Đáp án:

    

   cho ctlhn 

    

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2. a, (-5x).(2x²+3x-1)=-10x³-15x²+5x

   b,(3x-5).(2x²-x+3)=6x³-3x²+9x-10x²+5x-15=6x³-13x²+14x-15

   c,( 3x²y – 5x²y² + 7xy²): (-xy)= -3x+5xy-7y

   d, (4x² – 4x + 1) : (2x – 1)=(2x-1)²:(2x-1)=2x-1

    

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