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

Toán Lớp 8: Rút gọn biểu thức: A= 3x^2 (2x^2-3x+1)-x^3 (x+3) ; B= (12x-5) (4x-1)+(3x-7) (1-16x) Cảm ơn mí bn !!!!

Toán Lớp 8: Rút gọn biểu thức: A= 3x^2 (2x^2-3x+1)-x^3 (x+3) ; B= (12x-5) (4x-1)+(3x-7) (1-16x)
Cảm ơn mí bn !!!!

Comments ( 1 )

  1. Giải đáp:
     $a) A= 3x².(2x²-3x+1)-x³.(x+3)$
    $⇒ A= 6x^4-9x³+3x²-x^4-3x³$
    $⇒ A= (6x^4-x^4)-(9x³+3x³)+3x²$
    $⇒ A= 5x^4-12x^3+3x²$
    $ B= (12x-5).(4x-1)+(3x-7).(1-16x)$
    $⇒ B= 48x²-12x-20x+5+3x-48x^2-7+112x$
    $⇒B= (48x²-48x²)+(112x-12x-20x+3x)+(5-7)$
    $⇒ B=  83x-2$
     

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