计算题;1/2(2x²-6x-4)-4(-1+x+1/4x²)(某中x=5)
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计算题;1/2(2x²-6x-4)-4(-1+x+1/4x²)(某中x=5)
计算题;1/2(2x²-6x-4)-4(-1+x+1/4x²)(某中x=5)
计算题;1/2(2x²-6x-4)-4(-1+x+1/4x²)(某中x=5)
1/2(2x²-6x-4)-4(-1+x+1/4x²)
=x²-3x-2+4-4x-x²
=-7x+2
=-7x5+2
=-33
如果本题有什么不明白可以追问,
1/2(2x²-6x-4)-4(-1+x+1/4x²)
=x²-3x-2+4-4x-x²
=-7x+2
当x=5时,-7x+2=-7x5+2=-33