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

Toán Lớp 8: Thực hiện phép tính: (6x³-7x²-x+2): (2x+1)

Toán Lớp 8: Thực hiện phép tính: (6x³-7x²-x+2): (2x+1)

Comments ( 2 )

  1. $(6x³-7x²-x+2):(2x+1)$
    $=[(6x³+3x²)-(10x²+5x)+(4x+2)]:(2x+1)$
    $=[2x²(2x+1)-5x(2x+1)+2(2x+1)]:(2x+1)$
    $=(2x+1)(2x²-5x+2):(2x+1)$
    $=2x²-5x+2$

  2. (6x³-7x²-x+2):(2x+1)
    =[(6x³+3x²)-(10x²+5x)+(4x+2)]:(2x+1)
    =[2x²(2x+1)-5x(2x+1)+2(2x+1)]:(2x+1)
    =(2x+1)(2x²-5x+2):(2x+1)
    =2x²-5x+2

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