简化求值:4/1(-4x+2x-8)-(2/1x-1)其中x=2/1
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简化求值:4/1(-4x+2x-8)-(2/1x-1)其中x=2/1
简化求值:4/1(-4x+2x-8)-(2/1x-1)其中x=2/1
简化求值:4/1(-4x+2x-8)-(2/1x-1)其中x=2/1
原式=-x+2/1x-2-2/1x+1
=-x-1
=-2/1-1
=-2/3
-1.5