因数分解 3/14

1.x2 - 49
  = (x + )(x )

2.x2 - x - 30
  = (x + )(x )

3.4x2 + 33x - 27
  = (x )( x )

4.(x - 6)2 + (x + 3)(x - 6)
  = (x )( x )

5.x3 + 12x2 + 47x + 60
  = (x )(x )(x )

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