计算:2(x+1)+x(x+2)-(x-1)(x+5)
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计算:2(x+1)+x(x+2)-(x-1)(x+5)
![计算:2(x+1)+x(x+2)-(x-1)(x+5)](/uploads/image/z/19596877-61-7.jpg?t=%E8%AE%A1%E7%AE%97%3A2%28x%2B1%29%2Bx%28x%2B2%29-%28x-1%29%28x%2B5%29)
2(x+1)+x(x+2)-(x-1)(x+5)
=2x+2+x²+2x-(x²+5x-x-5)
=x²+4x+2-x²-4x+5
=7
=2x+2+x²+2x-(x²+5x-x-5)
=x²+4x+2-x²-4x+5
=7
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