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

Toán Lớp 8: x(1 –x) + (x + 1)(x –2) rút gọn biểu thức

Toán Lớp 8: x(1 –x) + (x + 1)(x –2) rút gọn biểu thức

Comments ( 2 )

  1. Giải đáp:
     $x.(1-x)+(x+1).(x-2)$
    $= x-x²+x²-2x+x-2$
    $= (x+x-2x)+(x²-x²)-2$
    $= -2$
     

  2.       x ( 1 – x ) + ( x + 1 ) ( x – 2 )
      = x – x² + ( x² – 2x + x – 2 )
      = x – x² + x² – x – 2
      = ( x² – x² ) + ( x – x ) – 2
      = -2

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