1:1  01-18[数学]杨老师教你对已知条件巧变形，轻松解题 推荐理由：幂的运算公式你能够熟练运用吗？杨老师教你从已知条件出发，灵活运用幂的运算公式，解决你无从下手的困扰！ 讲解人：http://www.jiandan100.cn/teacher/831c4e372041406cacba8139c4f16d8a/ ，北京优秀数学教师，常年辅导竞赛班。 题面：若  ，用x的代数式来表示y本部分内容设定了隐藏,需要回复后才能看到  跟帖分享你的答案，即可看到正确答案和解析！别忘了回帖后再点进来查看答案哦~对已知条件合理变形，巧用公式！ ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 查看更多本年级每周一题，请点击：http://www.jiandan100.cn/bbs/upload/forumdisplay.php?fid=378& 浏览本期“简单学习电子周报”完整目录：http://www.jiandan100.cn/bbs/upload/viewthread.php?tid=658520 |
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沙发#
发布于：2013-01-18 14:45
y=3+x2-2x-1+1=x2-2x+2
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板凳#
发布于：2013-01-18 17:13
y=3+x2-2x-1+1=x2-2x+2
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地板#
发布于：2013-01-18 19:12
y=3+4m
y=3+(2m)2 ∵x=2m+1 所以2m=x-1 y=3+(x-1)2 y=x2-2x+4 |
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4楼#
发布于：2013-01-18 20:29
y=3+x2-2x-1+1=x2-2x+2
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5楼#
发布于：2013-01-18 21:56
y=3+x2-2x-1+1=x2-2x+2不是很难啊！
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6楼#
发布于：2013-01-19 09:02
不知道
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7楼#
发布于：2013-01-19 16:13
因为y=4的m次方+3=2的m次方+2的m次方+1+1+1
又因为x=2的m次方+1 所以y=2的m次方+2的m次方+1+1+1=x+x+1=2x+1 |
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8楼#
发布于：2013-01-19 18:18
回复 #1 admin 的帖子
因为x=2m+1,所以2m=x-1.所以y=3+2【x-1】=2x+1 |
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9楼#
发布于：2013-01-19 19:10
 不会啊 |
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