2016-04-07 12:04发布
先化简，在求值：（2x-1)(x+2)-(x-2)^2-(x+2)^2,其中x=-1又1/2
（2x-1)(x+2)-(x-2)^2-(x+2)^2,
=2x²+3x-2-x²+4x-4-x²-4x-4
=3x-10
=3x（-1又1/2）-10
=-9/2-10
=-29/2
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（2x-1)(x+2)-(x-2)^2-(x+2)^2,
=2x²+3x-2-x²+4x-4-x²-4x-4
=3x-10
=3x（-1又1/2）-10
=-9/2-10
=-29/2
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