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

Toán Lớp 8: A=x mũ 2-3x mũ 2+3x-1 thay x=101

Toán Lớp 8: A=x mũ 2-3x mũ 2+3x-1 thay x=101

Comments ( 2 )

  1. A=x^2-3x^2+3x-1
    =-2x^2+3x-1
    =-2x^2+2x+x-1
    =-2x(x-1)+(x-1)
    =(x-1)(1-2x)
    Tại x=101
    =(101-1)(1-2.101)
    =100.(-201)
    =-20100

  2. Giải đáp:
    A= x^2 – 3x^2 + 3x -1
    A=-2x² + 3x -1
    A= -2x² – 2x – x -1
    A= (1 – 2x)( x -1)
    Thay x= 101 vào A ta có:
    A=(1 – 2. 101)( 101 -1)
    A= -201 . 100
    A= -20100
    Vậy A= -20100 khi x= 101

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