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按理說會有四種情况 丨x-2丨+丨2x+1丨=8所以化簡後會有4個結果 如下: 第一種是兩個都是正數 x-2+2x+1=8解x=3 第二種是兩個都是負數 -x+2-2x-1=8解x=-3 第三種是一正一負 x-2-2x-1=8解x=-11 第四種是一負一正 -x+2+2x+1=8解x=5
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