第1个回答 2015-06-28
2(x²-5/2x)+1=0
2(x²-5/2x+25/16)+1-25/8=0
2(x-5/4)²=17/8
(x-5/4)²=17/16
x-5/4=±√17/4
x=(5±√17)/4
第2个回答 2015-06-28
解:原方程用配方法,可化为
2(x-5x/2+25/16-25/16)+1=0
2(x-5/4)^2=17/8
x=5/4±√17/4=(5±√17)/4
第3个回答 2015-06-28
先同除2,把二分之一移到等式右边,然后方程两边同时加上十六分之二十五,解得x减四分之五等于±四分之根号十七,最后两解为四分之根号十七加四分之五,负四分之根号十七加四分之五。
第4个回答 2015-06-28
2(x-5/4)^2-17/8=0
就是2乘以括号里x-四分之五的平方再减去八分之十七
第5个回答 2015-06-28
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追答![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/3812b31bb051f81929d4619edfb44aed2f73e775?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
回答错了。