Question

(x²＋x＋5)(x²＋x－6)变形正确的是

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A．(x²＋x)²＋(x²＋x)－30

B．(x²＋x)²＋(x²＋x)－30

C．(x²＋x)²＋5(x²＋x)－30

D．(x²＋x)²－(x²＋x)－30

Answer 1

答案：D
解析：

原式＝[(x2＋x)＋5][(x2＋x)－6]=(x2＋x)2－(x2＋x)－30,选D.