A=3x.(x^3+2x-1)-x^2(x+2) B=(5x^2-x+3).(-2x)+3x^2.(x-1)+x C=x.(x+5)-3x-(x-2)+7.(x^2+2x) RÚT GON BIỂU THỨC

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1. `A=3x.(x^3+2x-1)-x^2(x+2)`

   `A=3x^4+6x^2-3x-x^3-2x^2`

   `A=3x^4-x^3-2x^2+4x^2-3x`

   `B=(5x^2-x+3).(-2x)+3x^2.(x-1)+x`

   `B= ( − 10 x^3 + 3 x^3 ) + ( 2 x^2 − 3 x^2 ) + ( − 6 x + x )`

   `B=-7x^3-x^2-5x`

   `C=x.(x+5)-3x-(x-2)+7.(x^2+2x)`

   `C=x^2+5x-3x-x+2+7x^2+14x`

   `C=8x^2+15x=2`

   Xin hay nhất

    

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2. Đáp án:

    

   Giải thích các bước giải:

   `A = 3x . ( x^3 + 2x – 1 ) – x^2( x + 2 )`

   `⇔ A = 3x^4 + 6x^2 – 3x – x^3 – 2x^2`

   `⇔ A = 3x^4 – x^3 + ( 6x^2 – 2x^2 ) – 3x`

   `⇔ A = 3x^4 – x^3 + 4x^2 – 3x`

   `B = ( 5x^2 – x + 3 ) . ( -2x ) + 3x^2 . ( x – 1 ) + x`

   `⇔ B = -10x^3 + 2x^2 – 6x + 3x^3 – 3x^2 + x`

   `⇔ B = ( -10x^3 + 3x^3 ) + ( 2x^2 – 3x^2 ) + ( -6x + x )`

   `⇔ B = -7x^3 – x^2 -5x`

   `C = x . ( x + 5 ) – 3x – ( x – 2 ) + 7 . ( x^2 + 2x )`

   `⇔ C = x^2 + 5x – 3x – x + 2 + 7x^2 + 14x`

   `⇔ C = ( x^2 + 7x^2 ) + ( 5x – 3x – x + 14x ) + 2`

   `⇔ C = 8x^2 + 15x + 2`

   Chúc bạn học tốt nha ^^

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