x2与2x-1计较求代数式2x的平方 x 3的大小

来源：蜘蛛抓取(WebSpider) 时间：2016-09-24 01:43 标签： 代数式2x的平方
【考点】；．【分析】首先两式作差再步利法和负数的性得出答案即可．【解答】解：225x+9-x2+5x6）=x2+3＞0，∵x3-x2+x-=x2（x1+（x-1）=（x1（2+10，∴x2x+6＜2x2+x+9．x-3）2-（-2）（-4）=x26+9-（x26+8）=1＞0，∴（x3＞（x-2）x-4）；∴x+y2+1＞2（+y-1．【点评】题考查式分解实际运用非负数性质利用差法比较大小关．声明：本试题解析著作权属菁优网所有，未经书面同意，不得复制发布。答题：73zzx老师　难度：0.68真题：0组卷：2
解析质量好中差
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