1、=9x+6x^2-3x=2x^2
=8x^2+6x
当x=1时,8x^2+6x=14
2、=1/2(-4x-4)-4(x-1+1/4x^2)
=-2x-2-2x+4-x^2
=-x^2-6x+2
当x=5时,x^2-6x+2=-53
9x+6x²-3(x-2/3x²）其中x=-1 (2)1/2(2x-6x-4)-4(-1+x+1/4
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