先化简,后求值:当x=2008时,求x³-5x²-x³-x²+2x+6x²-1的值

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先化简,后求值:当x=2008时,求x³-5x²-x³-x²+2x+6x²-1的值
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先化简,后求值:当x=2008时,求x³-5x²-x³-x²+2x+6x²-1的值
先化简,后求值:当x=2008时,求x³-5x²-x³-x²+2x+6x²-1的值

先化简,后求值:当x=2008时,求x³-5x²-x³-x²+2x+6x²-1的值

等于-1

原式=2x-1
=2*2008-1=4016-1=4015

2x-1

x3-x3-5x2-x2+6x2+2x-1=2x-1,代入得2*2008+1=4017

x^3-5x^2-x^3-x^2+2x+6x^2-1
=x^3-x^3-6x^2+6x^2+2x-1
=2x-1
=2×2008-1
=4016-1
=4015